Suncast? Outdoor Deck Storage Box - 99 gal. - Sam's Club.The Suncast 99-Gallon Deck Box makes it easy to organize the clutter in your backyard in a stylish and functional way. It has ample storage space, so you can keep items neat and tidy. This outdoor deck box can be used to store seat cushions, tools, swimming pool supplies, toys, yard and garden supplies and out-of-season.