We had a couple of old entertainment centers we just had junk in since we have a flat tv now, we moved them into the garage and keep our canned food and dog food bags in them and put a tarp over them so we dont look like crazy prepper people. Be sure you protect from rodents - we wrap the bags in heavy trash bags and use traps around the area. We live in a wet climate so we use dehumidifier in the garage all year round. You dont want damp, mildewy dog food.

For other supplies, we use wheeled plastic trash cans so we can move things around - with list taped inside lid so we know what is in them. Also have some duffles I bought at good will - heavy duty and well worn but put medical/first aid supplies and first aid guides in trash bags and put inside the duffles and hung them on hooks in garage. We also had a couple of old microwaves (I know we sound like hoarders) we put our solar battery charges, inverters, short wave radio, walkie talkies and electronic stuff in there - dont know if they will act as a faraday cage or not, but at least we know where stuff is if we need it. Sorry so long, got on a roll there!