...it's almost concerning how many times people suggest plastic totes, after ... I mention I'm looking for an alternative to plastic totes that waste space because they are V-shaped instead of U-shaped. Even the higher quality ones have wide lips on the top for the lid that prevent them from being right up against one another. Plus if you try to section them off on the insides with smaller squares you wasting even MORE space given they are rounded and oddly shaped there as well too! ...I think I'm going to look into either wine crates or making my own from thin wood or cardboard with ducktape?
I like zip-lock bags for food protection, it helps keep everything more individualized vs having the entire bin sealed up together. To each their own, but I just don't get why people overlook the inefficiencies of their shape and praise them so much as being a good value. I guess if you don't need to store them right next to each other the inefficiencies are not as obvious.
Yeah, its hard to not consider plastic. I like your Tin use idea, you can make them your self easily or even have a tin knocker do it for you.
But i will say this, you can 3D print in plastic/Carbon fiber in any shape you want. U, V whatever and exactly a perfect fit that will 100% save more space then just about any other option.