Magnetic closures are the one-hand winners for lunch boxes.

A lunch box with a magnetic flap or lid is the easiest thing for arthritic hands to open one-handed.

The reason is simple: magnets only need a light pull at the edge. You don’t have to squeeze, pinch, or hold any tension. You just get one fingernail under the lid and lift. Once the magnet parts, the whole thing swings open. That’s it.

Clasps and latches are the opposite. Even a single latch forces you to push against a spring while pulling the box apart. That’s a two-hand job for most people, and it gets painful when your joints are angry. Zippers are worse—pinching a tiny tab and pulling it around a curve is brutal. So skip those.

When you shop, look for the words “magnetic lunch box” or “magnetic bento box.” There are a few good ones, but don’t trust the listing photos. Read reviews for comments like “magnet is strong enough” or “opens too easily.” A weak magnet means the lid pops off in your bag, and that’s its own problem. A strong magnet will still open with one hand, just with a slightly firmer pull.

If you have arthritis, don’t buy anything with more than one clasp. You’ll regret it by day two.