The OR AirPurge Dry Compression Sacks are a great way to maximize space and keep your gear dry. The AirPurge features an air permeable waterproof fabric band that purges excess air from the bag during compression. The TPU laminated nylon main body is durable and lightweight. Roll-top closure and compression straps make loading and compressing the bag a snap. This is a great bag for self-support kayaking, canoeing, canyoneering, backpacking or just about anything else. Very useful when packing down or synthetic loft gear like sleeping bags or jackets.