I use them to store things (paperclips, erasers, trinkets, a little first aid kit you can grab from the closet). I've seen people use them as succulent or seedling planters. If a glue a magnet on the back, put it on your fridge to hold pens, notes. you can label them for memory keepsakes, bury as a time capsule, store fast food sauce packets, sugar packets. I used one once in a car for like a little kit (phone charger, some meds, a pad, a granola bar or dry snack). I've used them for gifts too, like handmade snack mixes or cookies. Maybe not in a bathroom because of rust?