How to Choose a Laptop Backpack: 13", 15" & 17" Sizing Guide

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 actually works, how to measure your laptop, 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 the padded compartment is designed with a little tolerance. The rule of thumb: match the compartment's stated size to your laptop's screen size, and you'll be fine.

How to measure your laptop

• Check the spec first: most laptops list their screen size (e.g. 13.3", 14", 15.6", 17.3") 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.
• If you're between sizes or have a chunky/gaming laptop, size up to the next compartment.

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.

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 Canvas Backpack (15.6") for light daily carry, the Vintage PU Leather Laptop Backpack (13–15") for a dressier look, or the roomier Vintage Waxed Canvas Backpack (15") if you over-pack.

17 inch — large laptops and travel

For 17" laptops, gaming machines, or anyone who wants a bag that doubles as a carry-on. A 17" backpack has more capacity and structure. Our Waxed Canvas Backpack (17", expandable 28–35L) and the rugged 30L Waxed Canvas Rucksack (17") both fit large laptops with room for travel gear.

Beyond screen size: 4 things that also matter

1. 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.
2. Capacity (litres): ~18–22L suits daily carry and college; 28L+ if you also pack for travel or the gym.
3. Comfort: padded, adjustable shoulder straps and a supportive back panel matter once the bag is loaded.
4. Organization: separate pockets for a charger, tablet, phone and cables save daily friction.

Quick size cheat-sheet

Want to browse by size? See all laptop backpacks (13–17"), or explore our canvas backpacks & rucksacks.

Frequently asked questions

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.

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.

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.

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 laptop backpacks (13–17") — padded protection in waxed canvas and leather, with free U.S. standard shipping and 30-day returns.