I just received 4 of these. While I am neither happy with my purchase or disappointed, they are excellent for storing and or transporting your gear, dog food, MREs, etc.. They are however, not as sturdy as a 50 caliber ammo can. Since I have eight metal 50 cal ammo cans, I have chosen to store all my heavy ammo in the metal cans and moved the lighter stuff to these cans. They are larger than the metal can and they do stack well on top of each other. They are airtight and they probably will take ..