30 L Backpacks

A 30-litre backpack can carry a change of clothes, a toiletry bag, and a laptop, making it suitable for an overnight stay or a full day of hiking. It's the capacity that replaces a carry-on without becoming a trekking bag. Below this size, you're still within daily travel, above it you’re set for several days away.

What a 30-litre backpack can carry extra

Compared to the daily size, the gain is mostly in height and depth. You can add a pair of shoes, a thick jumper, or a cycling helmet without squashing the rest. A 30-litre backpack is still manageable with one hand in a train corridor, which isn’t the case with larger sizes.

A 30L backpack for a night outdoors

Short weekend trips are the main use for this capacity. Four features make a difference in a 30L backpack: the side compression straps, which stop the contents from shifting when the pack is half full, the ventilated back with mesh foam, the separate laptop sleeve from the main compartment, and a flat zipped pocket for documents. Dakine, Eastpak, and VAUDE each cover this segment well, with different approaches to the opening design.

Opening and carrying a loaded backpack

Two types of openings are found at this size. The top load, which is more waterproof, requires emptying to reach the bottom. The panel opening, either U-shaped or full front, provides suitcase-like access and stores better in hotels. The hip belt remains slim at this volume, designed to stabilize rather than transfer weight.

Then there's the issue of size. The dimensions of a 30-litre backpack are not standard, so measure all three dimensions of the filled pack, including pockets and straps, then compare these to your airline's requirements before relying on it as cabin luggage.