I have a few of them and keep my chickens' feed inside my garage in winter. Have 2 different sizes.
I would check pet food stores, Ideal to keep dry dog food.
I purchased mine second hand.
Maybe tomorrow during day, I can go and see if there is a manufacturer mark in the plastic.
Just a note; A raccoon could easily pry one of those open, and enter your coop. (even with a clip on the loop)
BTW my chicken coop is a repuposed playhouse. The openings that above box is in,,,,, I have 1/4 inch hardware cloth, and serve as ventilation. I close the doors when threat of precipitation entering coop exist.
WISHING YOU BEST,,,,,,,,,,,,,,,,,,,,,,
