This is the Sea to Summit TPU Guide Waterproof Accessory Case Features: Watertight roll-top closure Top corner anchor points Convenient neck strap included Flexible and crease resistant Meets IPX8 testing standards of being waterproof at 10 meters for 1 hour Freezeproof-will not crack High strength, PVC-free TPU material A touch-screen device will work inside the case Size Guide Small: 5" x 4" Medium: 6.5" x 5" Large: 8.5" x 6" The TPU Accessory Case is exceptionally resistant to the demands of the trail or river. Welded construction and a super reliable roll-top closure with triple fold and double hook-and-loop fastener provide fully waterproof and dustproof performance. The PVC-free TPU material is strong, durable, flexible and resistant to UV and extreme cold-so it can be folded numerous times for pocket storage without cracking or discoloring. Designed with top corner anchor points for versatility.