bcw 400-count storage box for trading cards | 200 lb. test strength | (4-count) bcw the bcw storage box is the highest quality, most competitively priced cardboard storage box on the market today. they are constructed of white corrugated paper and have a 200 lb. test strength. use this box to store and protect collectible trading cards like: baseball cards, basketball cards, football cards, magic the gathering, yu-gi-oh, pokemon, and others. 4-count