There are a couple of key reasons people prefer to switch over to a bubble carrier in place of a traditional carrier:

1. Comfort: The biggest factor I’ve found in making the switch is that bubble carriers are just far easier to get around with than a traditional single strap shoulder carrier. Backpacks were designed for this purpose specifically, and cat backpack carriers are just a heck of a lot easier on your shoulders than that single strap is.
2. Safety: The bulk of backpack carriers come equipped with additional safety features that traditional carriers don’t have included. While this is largely because they are often designed for Adventure Cats it doesn’t mean those safety features are any less helpful for your typical cat just going on walks.
3. Cat Happiness: A lot of traditional carriers don’t provide the best view in the world for your cat. They can of course hear a lot through the mesh, but they often can’t see much through it. This is limiting and makes the trip boring! The space bubble lets your cat see everything going on around them and gives them a chance to check out the world.
4. Style: Let’s be honest, they’re just plain cool looking compared to a typical carrier. And it is way easier for other people to check your feline friend out as you take a walk! What could be better?!?!

If you’re still curious about traditional carriers (I still have one myself) then I would also recommend you read my other article here on the best traditional carriers out there. It should help you make a decision if you’re not sold on a backpack yet.

When you bring a new carrier home you’re going to want to take some time getting your cat used to the carrier before immediately loading her right into it and taking her for a walk.

While I understand you just got this really cool carrier and want to show it off and show your cat off I would suggest a gradual approach to use. This will ensure that you don’t scare your cat away from the carrier right away and then have to spend weeks getting he or she acclimated afterward.

So how do you go about it?  Well there are a couple of pretty simple steps you can take to ensure that your cat will end up loving the new carrier:

• When it first arrives be sure to let your cat explore and sniff it without trying to put her in it
• If you have any Feliway Spray you might also want to try spraying some of this on and in the carrier
• Be sure to leave it out in the open and place some treats inside the carrier so your cat associates the carrier with positive things
• Start out with short walks and don’t make the first trip to somewhere your cat hates (the vet or the groomer)
• Take your cat on multiple trips a week, but keep them short and end them with treats when you get home
• Over time work up to longer trips and start feathering in trips to the vet and other places

While it is not a necessity by any stretch of the word, many people that use bubble backpacks also have a desire to leash and harness train their cat to take it on adventures.

This is no surprise, if you want to show your cat the world you’d also want to let them out to actually get a chance to explore it a little bit.

There’s an excellent article available on AdventureCats.org that will tell you all about the best method to harness train your cat, but here’s a quick rundown just to get you started:

• Introduce the Harness: As with anything else (costumes, collars, etc.) you’ll want to introduce your cat to a harness slowly to ensure they associate positive things with it. This means letting them sniff it, letting their scent get on it, and of course rewarding them with treats when it is nearby. You can also spray some Feliway on it for an added benefit.
• Slip It On: Put the harness on your cat, but don’t actually tighten it up. This will let her get a feel for it without restricting her movement. Over time tighten the harness and then remove it after short periods of time working up to longer attempts. Again, treats and praise go a long way.
• Attaching the Leash: Once you’ve got your kitty used to the harness you can attach the leash to it and take her outside. This is where your let your cat do the exploring. Go at her pace and let her figure out what is of interest. As she gets more used to the world outside then you can start encouraging her to follow you and keep pace with where you want to go.

A few other tips:

• Always pick up your cat and carry them through the threshold of the door when you’re first harness training her. This makes her think that’s the only way to go outside. Otherwise she’s prone to learn the second the door opens she can bolt out.
• Don’t leave your cat unattended outside, especially with a harness and leash on. This is an easy way for your cat to get stuck and injured.
• Always ensure any cat that is going outside is microchipped at the least. I also recommend a breakaway collar with tags with your cats essential information.

This is one of those specs that's easy to assume is standardized across the category, and it's really not. Most of the bubble backpacks in this roundup land somewhere in the 15-18 lb range, which covers your average adult cat comfortably.

But it's not universal — one pick on this list is branded a "Large" carrier and its title even advertises up to 20 lbs, but the seller's own product description states the real capacity closer to 13 lbs once you read past the headline number. That's a meaningful gap if you've got a bigger cat and you're going off the product name alone.

Before you buy, don't just trust the size label in the title on Amazon — scroll down to the specific weight rating in the actual description and a couple additional reviews from the wild.

Honestly, yes, more often than not. New plastic and vinyl products almost always carry that off-gassing smell straight out of the box, and it's come up often enough across different brands in this category that it's clearly not a one-off bad batch — it's just what happens when a bubble window and its plastic frame have been sealed up in shipping for weeks.

The good news is it's temporary. Unzip the carrier all the way and let it air out somewhere with decent airflow — a porch, garage, or a room with a window cracked — for a day or two before you expect your cat to spend real time in it.

Wiping down the bubble panel and interior lining with a pet-safe cleaner speeds things along too. If the smell hasn't faded noticeably after a week of airing out, that's worth flagging to the seller, but for most of these, a couple of days does the trick.

It varies, and it tends to track pretty closely with price. The lower-cost picks in this roundup are more likely to draw complaints about straps fraying or zippers sticking and slipping off track after regular use — not universal, but a recurring enough pattern to go in aware of.

The pricier options generally hold up better here, with sturdier stitching and heavier-duty zipper pulls. A few things worth checking regardless of which one you pick: metal zippers tend to survive more open-and-close cycles than plastic ones, a chest buckle or strap stabilizer keeps the load from shifting and straining the seams, and reinforced stitching at the strap attachment points matters, since that's usually where a bag gives out first.

If you're buying on the lower end of the price range, it's worth handling it a little more gently — don't expect it to survive years of daily heavy use the way a pricier build might.

Generally, no — not the classic rigid, dome-shaped bubble backpacks, anyway. We cover this in more detail in our Fat Cat Backpack Review, but the short version is that a hard plastic bubble takes up space that doesn't compress, and most airline under-seat dimensions just don't leave room for it, even with the bubble panel swapped out. 

If air travel is actually on your itinerary, look for an expandable or collapsible-style carrier instead — one that can flatten down for the flight and open back up at your destination. A few of the picks in this roundup are built that way specifically, which is worth prioritizing if a flight is the whole reason you're shopping.

For what it's worth, we've had good luck flying with a different style of carrier (a 4-sided design, not a bubble backpack) on United specifically — details on that are in the linked review above. If a listing doesn't explicitly call out under-seat or airline compatibility, assume it wasn't designed with that in mind.

They're a genuinely nice feature when they work as advertised, but it's worth going in with realistic expectations rather than assuming a fan automatically means a cooler, happier cat.

Our fan-equipped pick in this roundup gets mixed feedback — plenty of buyers are happy with the added airflow, but others report the fan doesn't move much air or that the fan-and-light combo stops working reliably over time. It's also worth knowing that most of these fans run off a separate power bank you have to supply yourself, not a battery built into the bag, so it's really more of an add-on feature than something fully baked into the carrier.

If a fan is the main reason you're drawn to a particular pick, treat it as a nice bonus rather than the deciding factor — the mesh panels and ventilation holes built into these carriers do the bulk of the actual airflow work whether or not the fan is running.

There are several different kinds of carriers on the market and each one has perks and drawbacks.  Below I’ve given a high level description of each of the major types. Further down you’ll find a high level comparison of the major benefits of each different type of carrier and the potential shortcomings as well.

Cardboard Carriers:

The most common place you’ll find a cardboard carrier is at an adoption center or an animal shelter. Cardboard carriers are meant to be a very temporary solution to get your cat from the adoption center to your home. This should definitely not be considered a permanent solution for a laundry list of reasons, but the biggest two are that cardboard carriers are flimsy and they aren’t comfortable to hold.

One additional item to consider is that they don’t provide a great deal of ventilation which is key for any carrier and you can’t simply open a small portion of the carrier because the whole top is the only entry/exit point. To reiterate, you should only use this in unique circumstances.

Hard Carriers:

Hard carriers are probably the most common carrier around. They are generally made of a combination of plastic and metal. The frame itself is usually plastic with the door being made of a lightweight metal.  Hard carriers are very firm and provide a nice secure surface/place for your cat to travel.

The biggest concern with hard carriers is that they aren’t very comfortable to travel with (for the human!), even short distances. They typically have one big handle on the top and that is the only way to hold or move the carrier. This can make them irritating if you have to move your cat a long distance because hard carriers are typically heavier and they’ll be banging against your hips or legs with every step. One other thing that always freaks me out from a safety standpoint is I worry the handle will give and rip the top off letting the cat out while I’m outside.

Soft Sided Carriers:

Soft sided carriers are probably the second most common type of carriers, hard plastic carriers being the most common. Soft sided carriers are traditionally made of nylon or some derivation of it which makes them flexible and lightweight. They also usually have a solid set of short straps for easy carrying directly in your hand, but more importantly they have a larger and longer shoulder strap to let the weight rest instead of actively having to hold it up. This means they are a heck of a lot easier for you as an owner to carry around.

Generally soft sided carriers are comfortable for cats as well because they come with in included pad or piece of lambswool to stick inside on the bottom. Soft sided carriers come with all sorts of other features to make them better for different kinds of travel, for example the one on the left has fold down covers for the vents so you can help minimize outside sensory overload for your cat at stressful times.

There are also soft carriers that have cool features like pop out sides to expand the size of the carrier when it is stationary.  They are also great for storage purposes because they break down easily, many completely collapse in on themselves into a flat pancake style setup.

Soft carriers aren’t perfect by any means though. One key thing to keep in mind is that since they aren’t made of firm materials they can leave your cat to bounce around/dip up and down quite a bit as you move which might result in an unhappy cat or a motion sick cat. Be sure to check how firm the bottom is before purchase.

Backpack Carriers:

Backpack carriers are definitely somewhat of a novelty in the market right now, they are a variation on soft sided carriers. You can find all different sorts of them from ones that have a single bubble window on the back so your cat can see out to full on ‘soft style’ carriers with backpack straps so you can more easily hold your cat and walk around with them.  If you have trouble with the standard single shoulder strap on the soft carrier this might be a good option for you to consider, but be sure to get one with good ventilation.

Check out our full roundup of backpack carriers here.

Another common use for backpack style carriers is for adventure cats. Adventure cats are those types of cats that are commonly out in the open following their owner around on foot during hikes and walks (usually on a harness/leash).  The backpack carrier is a great spot to deposit your feline friend if a less than ideal situation appears that could endanger your kitty.

Suitcase/Stroller Carriers: 

Rolling carriers are generally another variation on soft sided carriers, on wheels. Rolling carriers were developed for folks that have difficulty carrying heavy objects around. Given that some of our cats these days are getting in the area of 20 lbs or more (I’m looking at you Maine Coon owners!) they can be pretty tough to lug around on a single shoulder strip.  Rolling carriers tend to be a bit larger than a traditional soft carrier and they also take away the strain of carrying the cat yourself by laying all the weight on the wheels just like a rolling suitcase.

My biggest gripe with these kinds of carriers is that the wheels are often tiny so they get stuck easily on pavement. On top of this the wheels are often made of plastic instead of rubber to keep things cheaper and this makes a ton of noise when you roll it. Most cats aren’t a fan of being in the carrier to begin with, loud noises don’t help with keeping them calm.

There’s no single right answer to this question. The right carrier for you and your furry friend is going to be different than the one I choose.  We all have different priorities and different cats too. I live downtown and I walk my cats to the vet, but other than that they hardly leave the house. This leads me to use a soft sided carrier because it is easy to throw the single strap over my shoulder and walk, but it also breaks down super easily and can be stowed away in my closet.

You might on the other hand need a carrier that fits a much larger cat that mine and your kitty might be less relaxed when traveling so more likely to claw the sides of the carrier. You might even have a cat that gets sick really easily during transport. This might lead you to a hard carrier for ease of cleaning.

So instead of me trying to pick the best carrier for you, let’s get you educated on picking the right carrier for yourself and your situation. These are the major areas of consideration you should keep in mind when selecting a carrier for yourself and your cat. I’ve put them in order of importance as well, primarily focused on the comfort and happiness of your cat:

The requirements for each airline and each train company are slightly different, but below I've provided some overview details for each of the major airlines in the United States. If you happen to be traveling on another airline then you'll have to take a look yourself.

You can usually find Google "[airline name] in cabin pets" for more details. Or check the table below for standard specs. Note some planes on some airlines are unique, so click the links for more details:

• American Airlines — 18 × 11 × 11 (soft-sided); 19 × 13 × 9 (hard-sided)
• Delta — 18 × 11 × 11 (soft-sided recommended; this is Delta's stated "fits most aircraft" size)
• United — 18 × 11 × 11 (soft-sided); 17.5 × 12 × 9 (hard-sided)
• Southwest — 18.5 × 13.5 × 9.5 (most generous of the five, same limit for soft and hard carriers)
• Alaska Airlines — 17 × 11 × 9.5 (soft-sided; smallest allowance of the five)

These are each airline's general published max, but actual under-seat clearance still varies by specific aircraft type, and a couple of secondary sources disagreed slightly on Southwest's height (9.5" vs. 8.5") and United's hard-sided depth — worth a direct confirm against the airline's own current pages before you fly.

We cover the general version of this question in a lot more depth in our Cat Bubble Backpacks Q&A, so if you want the fuller breakdown of why under-seat space varies so much, start there.

This is the single biggest source of buyer confusion in this whole category, and it's not close. Almost every carrier on this list gets a split reaction from owners — some say it's roomy, others say the exact same carrier felt too small — and that's not really a contradiction, it just means cats vary a lot more than a single marketed size class accounts for. Before you buy, measure your actual cat: length from nose to the base of the tail, height from the floor to the top of their shoulder while standing, and their weight.

Compare those numbers against the carrier's actual interior dimensions in the listing, not just the size label in the title (a "Large" or "for 2 cats" tag doesn't guarantee your particular cat will be comfortable inside). A carrier that looks roomy in the product photos can still feel snug the moment a real, fully-grown cat is standing up and turning around in it.

Honestly, it's mixed, and that split shows up across soft-sided and hard-sided designs alike, not just one style or one brand. Zipper quality is one of the most commonly flagged concerns across this whole roundup — some owners report years of trouble-free use, others report a zipper pull breaking off or the seams not feeling sturdy enough for a determined cat. Hard-sided carriers aren't automatically safer here either — even a solid-plastic design with sliding locks gets the occasional complaint about not feeling fully secure.

Our honest take: treat this as a real, category-wide trade-off rather than a reason to avoid any specific pick. Give a new carrier a firm once-over before the first real trip — test the zipper pulls, check the stitching at stress points — and expect a little more wear over time on the lower-priced options specifically.

Yes, and it usually comes down to how the carrier opens rather than anything else about it. Our SportPet hard-sided pick earns its spot largely because of this — it's built around a wide side-opening door specifically so you're not forcing a cat through a narrow front opening they can see and brace against.

If your cat is the type to plant all four paws and refuse to go in through the front, a side-load or top-load design is usually the easier fight to win, since you're working with gravity and a wider opening instead of pushing against a scared cat head-on. A front-loading-only carrier tends to be the toughest style for a reluctant cat, simply because they can see the whole ordeal coming and have the most room to resist.

Less than it might look like in the product photos. Our rolling pick's aggregate owner feedback consistently describes it as easy to put together and take apart — mainly attaching or detaching the wheeled base and folding the carrier flat when you're not using it, not a full tool-based build. One honest thing worth knowing before you buy this style specifically: once you pop the carrier off the wheeled base, the bottom loses its firm support and can sag a bit under your cat's weight, so it's really designed to be used on its wheels rather than carried by hand for any real distance.

It depends heavily on the size of your cats, which ties right back into the measuring advice above. Our multi-cat pick is explicitly marketed and sized for two cats sharing the space, and its aggregate owner feedback does back that up — plenty of owners say it's genuinely spacious enough for two. But given how often "roomy vs. too small" feedback splits across this entire category, we'd treat "fits 2 cats" as true for two kittens or two smaller-to-average adult cats rather than assuming it's true for any two cats regardless of size.

Measure both cats individually, not just the smaller of the two, and remember that even a carrier with enough physical square footage only works well for two cats who are actually bonded and comfortable sharing a small space — two cats who tolerate each other but wouldn't choose to cuddle up together may still stress each other out in a shared carrier no matter how much room is technically available.