So...here is the way we've been doing zero-waste bread for the last year + a bit. An unpackaged loaf of bread is sliced at the store + put into a cloth bag from home. (I made my bags with the dimensions of a bag from the store as a guide. I like the bag to be big enough to slide over the loaf, but small enough to hold the sliced loaf together.) At home, I put the bread (cloth bag + all) into a plastic bread bag that we use over + over (I would imagine that a nylon baggu bag would work just as well). I just twist the bag closed, and it will keep in the fridge for a week. If I have part of a loaf still in the fridge when I bring home a new loaf, I'll put the new one into the freezer. When someone uses up the last of the refrigerated bread, they move the frozen loaf into the fridge.
If I was shopping for one or two people (instead of a family), I may split the loaf in half...storing half in the freezer + half in the fridge. This would keep the bread fresh + ready to eat as bread or toast. Hope all of that makes sense! :)