Sealed bento compartments are the answer—just not the cheap ones.

Sealed bento boxes with gasketed compartments are your best bet for allergen safety, but only the ones that actually seal each section shut, not the ones with open plastic dividers.

The open-divider kind is just a tray with walls. Crumbs migrate, sauces slosh, and oils creep into the next compartment the second the box gets jostled in a bag. If you’re packing for someone with a serious allergy, that’s a gamble. You want gaskets, latches, and per-compartment seals.

What to look for: food-grade silicone or rubber gaskets that sit between the lid and each section, sturdy latches (not just a friction lid), and dishwasher-safe plastic or stainless steel. Yumbox makes these with labeled kids’ sections but they work fine for adults too. LIHIT LAB and several dedicated bento brands make leak-proof versions as well. Skip wooden boxes for anyone with allergies—wood absorbs oils and proteins and you’ll never fully clean them.

A few ground rules beyond the box: dedicate that bento to the allergic person and nobody else touches it. Label it if you’re in a shared kitchen. Even inside a sealed box, wrap or containerize the allergen-heavy food separately—think a small screw-top jar for peanut sauce instead of just pouring it in. And wipe down your prep surfaces before you pack, because the box is the last line of defense, not the only one.

A $40 sealed bento is cheaper than an EpiPen copay. This is not where you save six bucks.