The single most important thing when buying a laptop backpack is getting the size right. Too small and your laptop won't fit (or won't be protected); too big and the bag feels bulky and half-empty. This guide explains how laptop backpack sizing works, how big a 13, 14, 15.6 or 17-inch backpack actually is, and which size fits your needs — for work, college and travel.
How laptop backpack sizing works
When a backpack says it fits a “15-inch laptop,” that number refers to the laptop's screen size measured diagonally, not the physical dimensions of the bag. Two laptops with the same screen size can have slightly different footprints depending on bezel size and build, so treat the stated size as a starting point: match it to your laptop's screen size, then compare your laptop's actual width and depth with the bag's listed dimensions.
In most backpacks the laptop stands upright against the back panel, with its long side running top to bottom. That means the bag's height has to clear your laptop's width, and the bag's width has to clear its depth — which is why a 15.6" backpack is usually around 17–19 inches tall.
How to measure your laptop
- Check the spec first: most laptops list their screen size (e.g. 13.3", 14", 15.6", 17.3") and their width × depth × thickness on the manufacturer's site.
- Or measure it: measure diagonally from one corner of the screen (not the lid) to the opposite corner, in inches. Then measure the closed laptop's width, depth and thickness.
- If you're between sizes or have a chunky/gaming laptop, size up to the next compartment.
Laptop backpack size chart
Typical sizes by screen size. Laptop and bag dimensions vary by model, so use these as a guide and check the listed dimensions before you buy.
| Laptop screen | Typical laptop size (W × D) | Typical backpack (H × W, capacity) | HuaChen option |
|---|---|---|---|
| 13–13.3" | about 12 × 8.5 in | 16–18.5 × 11–12 in, 14–24L | PU Leather Laptop Backpack: 18.5 × 11.8 in, 23.6L |
| 14" | about 12.5 × 8.8 in | 16.5–18 × 11–12.5 in, 16–24L | Vintage Canvas Backpack: 16.5 × 11 in, 18.7L |
| 15–15.6" | about 14.2 × 9.5 in | 17–19 × 12.5–14 in, 20–30L | Vintage Waxed Canvas Backpack: 18 × 13.5 in, 22L |
| 17–17.3" | about 15.7 × 10.4 in | 19–21 in tall, 30L+ | Waxed Canvas Backpack X-Large: 21 × 18.9 in, 50.7L |
Which laptop backpack size is right for you?
13–14 inch — light and compact
Best for ultrabooks and students who carry light. A 13–14" bag is slim, easy to commute with, and ideal if you mostly carry a laptop, charger and a few essentials. If you want hands-free, slim carry, a crossbody style works well here — see our 14" canvas messenger bag. For a backpack in this size, the Vintage Canvas Backpack (14", 18.7L) suits light daily carry, and the Vintage PU Leather Laptop Backpack (13", 23.6L) gives a dressier look.
15 – 15.6 inch — the most common choice
The default size for most work and college laptops. A 15–15.6" backpack balances protection and everyday capacity without feeling bulky. Good options include our Vintage Waxed Canvas Backpack (15.6", 22L), the Waxed Canvas Rucksack (15.6", 28.7L) if you over-pack, and the Waxed Canvas Backpack in Large (fits up to 15", 24.2L).
17 inch — large laptops and travel
For 17–17.3" laptops and gaming machines, choose a backpack rated for 17" laptops and check its height: the bag needs to be roughly 19 inches tall or more. Gaming laptops are also thicker, so check the sleeve depth too. Our Waxed Canvas Backpack in X-Large fits laptops up to 17.3" (50.7L, 21" tall) — it's a large travel rucksack rather than a slim commuter bag.
15.6 vs 17 inch backpack: what's the difference?
A 17.3" laptop is roughly 1.5 inches wider and 1 inch deeper than a 15.6" one, so 17" backpacks are usually a couple of inches taller and noticeably bulkier on your back. A 15.6" laptop will fit in a 17" bag, but it can slide around unless the sleeve has a strap or snug padding. A 17" laptop will not fit a 15.6" sleeve. If you don't carry a 17" laptop, a 15.6" backpack is the more comfortable everyday size.
Beyond screen size: 4 things that also matter
- Padding and protection: look for a dedicated, padded laptop sleeve — ideally one that sits slightly off the bottom of the bag so a drop doesn't jolt your laptop.
- Capacity (litres): ~18–22L suits daily carry and college; 28L+ if you also pack for travel or the gym.
- Comfort: padded, adjustable shoulder straps and a supportive back panel matter once the bag is loaded.
- Organization: separate pockets for a charger, tablet, phone and cables save daily friction.
Want to compare sizes side by side? See all HuaChen backpacks, or explore our vintage waxed canvas & leather rucksacks.
Frequently asked questions
How big is a 15.6-inch backpack?
Most 15.6" laptop backpacks are about 17–19 inches tall and 12.5–14 inches wide, with 20–30L of capacity — similar to a standard school backpack. Our 15.6" daypacks measure 18 × 13.5 inches (22L) and 17.3 × 13 inches (28.7L).
Will a 15-inch laptop fit in a 15.6-inch backpack?
Yes. A 15.6" compartment comfortably fits 15" and 15.6" laptops. Compartment sizes include a little tolerance, so you don't need an exact match — just don't go smaller than your screen size.
Will a 15.6-inch laptop fit in a 17-inch backpack?
Yes, but it will have extra room. If the sleeve has no strap or snug padding, use a laptop sleeve so it doesn't slide around.
Can I put a 17-inch laptop in a 15-inch backpack?
No — a 17" laptop won't fit safely in a 15" sleeve. Choose a backpack rated for 17" laptops, such as the Waxed Canvas Backpack in X-Large (up to 17.3").
What size laptop backpack do most people need?
15 – 15.6" is the most common, because it fits the majority of work and college laptops while staying comfortable for daily carry.
How much capacity (litres) do I need?
For a laptop, charger and a few daily items, 18–22L is plenty. Choose 28L or more if you also pack clothes or use the bag for short trips.
Ready to find the right fit? Shop HuaChen backpacks for 13–17.3" laptops — padded protection in waxed canvas and leather, with free U.S. standard shipping and 30-day returns.
