The Therm-a-Rest Z-Shield Sleeping Pad is a closed-cell foam mattress for a wide range of uses. Featuring an accordion design, you won't be able to play it like a musical instrument, but it will allow you to fold it up nice and compact. Just strap it to your pack with those useful pad straps towards the bottom of your pack. Unless your pack doesn't have those. Great for use in mild weather, boosting the warmth of a second pad in colder weather, in emergencies or even as a floor mat to protect another mattress when you're camping lean-to style. Whatever you use it for, at just 12 ounces in weight it'll be an easy addition.