Get a hard plastic box, not a lunch bag
A hard-sided plastic container like the Sistema Bento Box is the best lunch box for someone cycling to work. It’s compact, lightweight, and won’t let your pannier squish your lunch into a sad paste.
The problem with soft lunch bags is in the name: they’re soft. In a pannier, everything you carry ends up on top of everything else. A bag allows that pressure to transfer straight to your sandwich. A rigid box with a flat top takes the load and keeps your food intact instead.
The Sistema Bento Box works well because it’s designed for lunch, not leftovers. It has separate compartments so things don’t get mixed, a clip-lock lid that stays sealed after a bumpy ride, and it’s made from polypropylene that can take a beating without cracking. It also sits low in the pannier, so you can
