I just bought myself a food/herb dehydrator two months ago and had collected these from my daughter, who kept about 2 dozen empties (although she didn't know why!).
I have been using these to store dried herbs from my garden, and dried fruit bits and specific dried herbs to make my own herbal teas. I plan to dry veggies this week in small batches and make up my own dry soup mixes.
I keep one for broken needles, bent pins and disposable sharps in the sewing room.