Buying guides

How to Choose a Backpack

By The Shopi Team · 7 min read

Figuring out how to choose a backpack sounds trivial, until you own three of them and reach for the same one every morning anyway. A backpack is one of the highest-use items most people buy: you wear it on your body, often loaded, sometimes for hours. Get it right and you forget it's there. Get it wrong and you feel it in your shoulders, the zippers split, and your laptop rattles around in a pocket that was never sized for it.

The trouble is that "best backpack" roundups tend to blur every use into one ranking, and many of them earn a commission on whatever they crown. This guide skips the leaderboard. Instead it walks through the handful of criteria that actually decide whether a pack fits your life, capacity, fit, organization, and materials, so you can judge any bag against your own needs rather than someone else's payout.

Start with the job, not the bag

The single biggest mistake is shopping for a backpack in the abstract. There's no universally good pack, only a good pack for a specific job. A bag that's perfect for a daily train commute is overbuilt for the gym and useless for a three-day hike.

So before you look at a single product, name the job honestly. Not the aspirational version where you finally start trekking on weekends, the real one where you carry a laptop, a water bottle, and lunch five days a week.

A few common categories and what they tend to prioritize:

• Commuter / work: a padded laptop sleeve, a clean professional look, quick access to small items, and room for daily essentials without bulk.
• School / everyday: durability above all, plenty of pockets, and comfort over long days of wear.
• Travel / carry-on: a wide opening for packing, capacity that stays within airline limits, and security touches like lockable zippers.
• Hiking / outdoor: a real suspension system (hip belt, frame), weather resistance, and load capacity sized to the length of the trip.
• Gym / sport: ventilation, a separate pocket for shoes or damp kit, and easy in-and-out.

If you genuinely have two jobs, say commuting and weekend travel, decide whether one bag can stretch to cover both or whether you're better off with two purpose-built ones. Forcing a single pack to do everything is how people end up disappointed in all of them.

Get the capacity right (bigger isn't better)

Backpack volume is usually measured in liters, and it's the spec people most often get wrong, almost always by going too big. The logic feels safe ("I'd rather have extra room"), but a larger bag invites you to overpack, sits heavier on your back, and looks slouchy when it's half-empty.

Rough framing, not rules:

• Small (around 10 to 20L): a minimal daily carry, a light commute, or a packable extra.
• Medium (around 20 to 35L): the everyday workhorse, room for a laptop, a layer, lunch, and odds and ends. The size most commuters and students actually need.
• Large (around 35 to 50L): travel and carry-on territory, where you're packing clothes for several days.
• Extra large (50L and up): multi-day hiking and expedition loads, almost never what a city dweller needs.

For travel specifically, the number that matters more than liters is whether the packed bag fits your airline's carry-on dimensions, and those vary between carriers. Check the actual measurements (height, width, depth), not just the volume, before you assume it'll make it into the overhead bin.

Fit and comfort: the part people skip

A backpack is the rare product you wear, so fit isn't a nicety, it's the whole point. A beautifully made pack that sits wrong on your back is a bad pack for you.

What to look at:

• Shoulder straps: wide, padded, and contoured beats thin and flat, especially under load. Some are shaped differently for narrower or broader frames.
• Back panel: padding and ventilation channels keep the bag off your spine and let air move, which matters a lot if you sweat or carry far.
• Sternum strap: that little clip across your chest pulls the shoulder straps inward so they don't slide. Small part, big comfort difference.
• Hip belt: for anything heavy, this is what transfers weight off your shoulders and onto your hips. A daypack can skip it; a loaded travel or hiking pack shouldn't.
• Torso length: on larger packs, fit depends on the length of your back, not your height. A pack sized to your torso carries dramatically better, which is why serious hiking packs come in sizes or adjust.

Weight rides best close to your body and high on your back. If you can, load a pack with something heavy in the store and wear it for a few minutes. An empty bag tells you almost nothing about how it'll feel full.

Organization vs. flexibility

Here's a real trade-off with no right answer: heavily compartmentalized packs keep your gear sorted and reachable, but every pocket, divider, and zipper adds weight, cost, and rigidity. A simple single-compartment "bucket" is lighter and endlessly flexible, but small things sink to the bottom.

Decide which frustrates you more, hunting for your keys, or being told where everything has to go, and shop toward that.

A few specifics worth checking:

• Laptop sleeve: if you carry a laptop, confirm the sleeve actually fits your screen size, that it's padded, and ideally that it's suspended off the bottom so a dropped bag doesn't jolt the machine. Pairing the bag to the device cuts both ways; our guide on how to choose a laptop covers the other half.
• Quick-access pockets: a top or front pocket for phone, keys, and transit card saves you from opening the whole bag twenty times a day.
• External attachment: water-bottle pockets, compression straps, and gear loops matter for sport and travel, less so for office use.

Materials, zippers, and what "durable" really means

Durability is where marketing language gets vague, so it helps to know what to look at.

• Fabric: most backpacks use nylon or polyester. Fabric thickness is often listed in denier (a "D" number); higher denier generally means a thicker, tougher, heavier fabric. Nylon variants tend to be more abrasion-resistant, while canvas and leather look great but add weight and need care.
• Water resistance: a water-resistant coating sheds drizzle; true waterproofing (sealed seams or a roll-top) survives a downpour. Many bags include or sell a separate rain cover. Match this to your climate and commute, not the worst storm imaginable.
• Zippers: cheap zippers are usually the first thing to fail on an otherwise fine bag. Look for chunky, smooth-running zippers, and water-resistant or storm-flapped ones if you're often caught in rain.
• Stitching and stress points: reinforced (bar-tacked) stitching where the straps meet the body is a quiet sign of a bag built to last.

None of this means "buy the most rugged thing you can find." A heavily armored expedition pack is overkill, and overweight, for carrying a laptop across town. Durable enough for your actual use is the goal.

Match the spend to the use

Backpacks span a huge price range, and more money mostly buys better materials, a more refined fit, stronger hardware, and sometimes a longer warranty, not necessarily a bag that suits you better.

Thinking in rough tiers helps:

• Budget: fine for light, occasional, or short-term use. Expect simpler materials and hardware that may wear faster.
• Mid-range: the sweet spot for most daily users, solid materials, comfortable carry, and a decent warranty.
• Premium: specialized performance, top-tier fabrics and zippers, and often a generous repair or lifetime warranty. Worth it if you'll use the bag hard or daily for years.

The honest question isn't "what's the best?" but "how hard will I use this, and for how long?" A pack you'll wear every day for five years justifies more than one for occasional trips. If you want a structured way to land on a number, our guide to setting a shopping budget helps, and a longer warranty can quietly be the better value even at a higher sticker price.

Questions to answer before you buy

Before you start searching, write down your answers to these. They turn a fuzzy "I need a backpack" into a precise filter:

1. What's the real, primary job? (commute, school, travel, trail)
2. What's the largest thing I carry daily? (laptop size, gym kit, camera)
3. How long will I wear it at a stretch, and how loaded?
4. Does it need to meet airline carry-on limits?
5. What's my realistic budget, and how many years should it last?
6. Can I return it after loading it up at home?

With that list in hand, you can compare any two bags on what matters to you instead of on a reviewer's ranking. If you want a repeatable method, our piece on comparing products objectively lays one out, and it's worth a quick pass on how to research a product before buying so the reviews you lean on are the trustworthy ones.

How to choose a backpack without the noise

This is where a tool like Shopi earns its keep, precisely because it has nothing to gain from your decision. Shopi runs no affiliate links, no ads, and no commissions, so it makes the same amount (nothing) whether you buy a budget pack or a premium one, and has no reason to steer you toward either. It learns your actual needs, budget, and the things you care about, then explains every recommendation in plain language with a relevance score for why it fits you, and links you straight to the product's own page when you want a closer look. You can see how it works first. To be honest about the limits: the AI can still get things wrong, and no tool can try a bag on your back, that part's on you. If you're curious, there's a free demo with no signup, though it runs on a sample shopper profile, so it won't reflect your needs until you spend two minutes on a free profile of your own. After that, the recommendations are about your jobs, your budget, and your back.