After buying bread, poke a small hole in the opposite end from the main opening and put it in the refrigerator. The bread lasts longer and with the little bit of air seeping in, it keeps the bread at the deep end from developing mold.
Just a quick note: The holes prevent molding because it lets moisture out, not because it lets air in. Letting air in is actually a bad idea because it encourages spoilage. That's one reason we vacuum pack things. It's also a good idea to squeeze the air out before closing bags, even if the contents doesn't require refrigeration. Mold and bacteria need air to thrive.
Moisture also encourages spoilage so letting it out is helpful. It's the same reason vegetable bags have holes in them. And if you bags don't have holes, poke holes in them before putting them in the fridge. Veggies will last much longer.
I generally just refrigerate the bread and without poking holes. Having holes will allow the bread to absorb odors, which I don't want.
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