Skip the lunch box, get a dry bag

The best “lunch box” for cyclists and motorcyclists is a small roll-top dry bag, not anything actually sold as a lunch box.

Dedicated waterproof lunch boxes barely exist as a category, and the ones that do are usually just hard coolers with a gasket — bulky, awkward to strap down, and annoying to carry once it’s empty. On two wheels you want something that packs flat when not in use and stays sealed when rain hits at speed. “Water-resistant” zippers don’t cut it.

The practical move: get an 8–13 liter dry bag. A Sea to Summit Ultra-Sil is cheap, weighs nothing, and rolls down to the size of a fist when empty. Ortlieb makes the bombproof version if your bike already lives in that ecosystem. You lose insulation and padding, so wrap fragile stuff or use a container inside — but your food stays dry, which is the whole point.

If you truly want an insulated lunch bag shape, the Overboard waterproof insulated lunch bag is the one purpose-built option actually worth buying. Roll-top closure, welded seams, floats, the works. It’s pricey, but it’s the only thing that does the job out of the box without modification.

For motorcyclists specifically, a strap-down soft dry bag like Kriega’s US-series doubles as both your lunch carrier and a general tail bag, so you’re not buying a one-trick item.

Your sandwich staying dry beats any branding claim.