Soft coolers win for hiking lunches.

The best lunch box for hiking is a soft-sided insulated cooler, not a rigid lunch box.

Here’s why: a hard lunch box is dead weight even when empty, doesn’t pack flat, and it’s one more rigid thing to cram into a daypack. A soft cooler straps to the outside of your pack, squishes into gaps, and weighs almost nothing. The Hydro Flask Day Escape and Yeti Day Trip are the well-known ones and they’re fine, but honestly a $20 Amazon basics insulated tote does 90% of the job.

If you’re car camping, ignore all of this and just use a real cooler. If you’re backpacking in bear country, the bear canister is your lunch box and your dinner box and your everything box. And if none of your food needs to stay cold, a dry bag works better than any “lunch box” ever made.

Don’t overthink it. Soft, light, and packable wins.