The best combination of weight, livability, and versatility out of any ultralight shelter on the market. The Zpacks Duplex Shelter is impossibly lightweight with exceptional bug and wet weather protection from all sides, all while offering plenty of space inside for two people. Constructed out of Dyneema – a fabric commonly used in boat sails because of it's exceptional strength-to-weight ratio, the Zpacks Duplex is ready for whatever the trail throws at you. The "Flex" upgrade gives you the ability to make it into a freestanding tent, albeit adding some weight to your pack. Note that this Duplex does not come with stakes or poles if you don't opt for the Flex upgrade.