Clear containers for anything that isn’t commercially labeled. My wife used to wrap leftovers (or anything, really) in aluminum foil. more than two thirds of the time I’d end up throwing it out after a couple of weeks because, since nobody knew what was in the mystery packages, nobody ate it. I bought some glass storage containers (the kind with the plastic, locking lids) so it’s obvious what is contained within. A lot less waste.

Also, I’ve got pull-out bottom freezer with one basket and one deep “bin” and shit got lost so I 3D printed dividers and organized it.