I need a new system for storing home-made dog food in the freezer. I make a giant batch of about a month's supply and then store it in a small freezer. I don't think I can fit square plastic tupperware containers. So far, I've been freezing each day's worth of food in a gallon bag, which freezes flat. The problem is that I end up tossing the bags as it is a hassle to hand-wash and dry plastic bags. I haven't figured out how to clean them in the dishwasher either. This seems too wasteful so I need to find a better environmentally friendly system. Any suggestions on how to freeze mass quantities of food?