Universal Mattress Stuff Sacks provide long-lasting, water-resistant protection for your mattress. Designed to fit every mattress in the Therm-a-Rest® line, these rugged stuff sacks come in a range of sizes, from 1.5L to 36L. Made of lightweight, durable ripstop nylon fabric, Universal Mattress Stuff Sacks include a clip loop for easy unpacking and an end handle for portability.