Hard containers with flat lids are the only safe place for a sandwich

Yes, a hard-shell container with a flat lid is absolutely better for keeping a sandwich from getting squished, and the ideal size lets the sandwich lie flat with some breathing room above it.

Cloth bags and soft insulated totes do nothing structurally. The moment you toss your bag on the passenger seat or stack a water bottle on top, the bread gets crushed. A hard container — plastic, metal, or glass — takes the pressure instead of your sandwich. The key is a flat, rigid lid. A domed lid can flex under weight, and a snap-on lid that bends in the middle is basically a squish machine.

For size: measure your sandwich. A thick sub needs internal height at least 1.5 times the sandwich thickness. If your sub is 2 inches tall, you want a container with at least 3 inches of internal height. Length matters too — a 6-inch sub needs about 7 inches of interior space; a footlong needs a full 12-inch straight container, or you’re bending the bread. Wide base, flat bottom, no taper.

Best practical option: a rectangular plastic “sandwich keeper” with a stiff, flat lid that locks on all four sides. You can find them in most kitchen sections. They’re cheap, stack fine in a bag, and they don’t let the lid pop off. Glass works even better but adds weight. For subs, look for one that’s clearly marketed for ’subs’ — usually 9 to 10 inches long, deep, and boxy.

Just make sure the sandwich actually fits before closing it. If you have to press the lid down, that’s the problem.

Your sandwich will thank you at lunch.