Specifically, storage in a large, sturdy black trash bag or in a Toys R Us brown bag?

I don't think so, probably not.

I sure hope not, mine are stored in black trash bags for cheap water/moisture protection. A toysRus bag or other cheap plastic bags from stores don't have any water protection so I wouldn't use them, but the heavy duty trash bags actually do quite well if you don't want to plunk down tons of money for nice ziplock or vacuum bags.

I doubt it. If you store it for a SUPER long time and it is sometimes exposed to the sun, I guess the bag could fuse with the box. I doubt it does anything if you have the boxes in a dark place though. ;)

I doubt it. I guess over time, if the sets are stored in an area that get some heat or sunlight, the bag could fuse to the box, but this is unlikely. As long as it is a dark area, it is good, I think. At least from my own experience.

The Lego boxes are created with a process that leaves a surface layer of plastic on the printed surfaces. Similar types of plastic can adher to each other, but I think you are safe with plastic trash bags. I have been experimenting with wrapping some Lego boxes in the polyvinyl food wrap sold at Costco called stretch-tite. I have been worried about it adhering to the printed surface of the Lego boxes, but so far so good (about 9 months on the first boxes). I just want something to protect the boxes from shelf-wear and moisture but still allow me to see them. I like that it stretches tight, clings to itself and is clear (oh, and very cheap!). It comes in a box of 12 inches by 3,000 feet for about $32.

Sorry for the double post. I thought the comment wasn't posted so I retyped it up.

Thanks for the feedback! What about two sets stored with their sides touching each other? A no-no?

Sorry for the double post. I thought the comment wasn't posted so I retyped it up.

That happens to me sometimes. :)