Store, charge and transport LiPos in a LipoSack. They come in various sizes for different size (energy density) packs.
http://liposack.com/
(FWIW, I only use the genuine Liposack; I've seen some cheaper copies and wouldn't use them except for perhaps 2s Rx batteries)

Do NOT store, charge or transport them in a sealed enclosure.
Do NOT store, charge or transport all of them together in the same container; individual LiPo sacks are best to help prevent one battery from igniting another battery.