My mother always put rice in the salt shaker to keep it from clumping up in hot weather (our house had no air conditioning), as it would absorb some moisture, I assume it has the same effect on bread.

I bought some micro-perforated baguette bags recently, they're only 6" across so they won't hold anything bigger than baguettes, but they appear to have characteristics similar to paper bags in terms of keeping the bread from getting too moist or drying out too fast. Haven't used them enough to form an opinion on them yet.

I put some left over popovers in them, they didn't get super soft like they usually do in regular plastic bags, but they did go moldy in 3-4 days, which seemed to be about how long they'd last in regular plastic bags.