Space Bag® uses a turbo vacuum seal valve and double zipper to store and organize up to four times more items. It's guaranteed to be air- and water-tight, and the new turbo valve vacuums out air 35% faster than other Space Bags®. Adds extra capacity to your hard storage containers and moving boxes. Box-bottom bags offer 25% more capacity than standard flat bags and are top loaded and stackable. Use Ziploc Cube bags for Bedding and Ziploc Flat Bags for Clothing. See Video under Features Tab!