Honestly, your first concern isn't what to put it in, but where it's going. You have 3 things to worry about- temperature, moisture, and dust. Too much extreme for any of these can be detrimental to your systems.
Dust is easy- put it in a container of some kind. Preferably a plastic box with a lid, but cardboard can be OK if the other two are controlled well. Adding desiccant to the box can help deal with moisture- you can either save silica packets as they turn up in other products, or just buy a big box of the stuff. It's not uncommon to find in craft stores for use in drying flowers, although you'll need to get a breathable material to make a pouch out of to hold it (perhaps a tulle or cheesecloth?)
Temperature is always the hardest, storage spaces are rarely temperature controlled. I always go by the idea that stored electronics should be in a 'living' space- somewhere you personally send a great deal of time (since that's almost always going to have a thermostat set to an appropriate temp). Closets, under beds, maybe even a laundry room depending on your personal setup (that might be too moist if you regularly air-dry clothes in it, for example.) If these places are full, check what's in them- perhaps there's something that could stand being moved to a less climate controlled storage space? Or perhaps your stuff could be re-organized to make more space? Look things over & really think about it, there's probably a solution in there somewhere.
