Jan 08, 2020 - 01:40 PM
They sell these on Amazon, (on sale now for $8.49):
Sterilite Ultra*Seal 8.3 Cup Container
They are a perfect size with room to spare, you want about 30 square inches of surface area per 100 Superworms. For 250 that would be 75 Square inches of surface area.
You'll want to leave the lid off, and add bran/bedding to only 1.5" deep to allow moisture and heat to escape.
Have a look at this video, it shows the very best way to store them by keeping them shallow (1.5" deep) and a lot of bran to superworm ratio.