Zenbivy Dry Sacks feature fully-welded seams for a watertight seal you can trust, instant compression through the high-speed mechanical valve, and durable yet lightweight construction. Zip Sacks are an easy way to keep the small items in your pack easily accessible and dry throughout your hike. All Zenbivy Beds and Quilts come with a Mesh Storage Sack, but we've got extras in case you need one!