Billabong Surftrek Storm 40L Roll Top Wet / Dry Backpack – Military. Fabric: Durable PVC and dual side waterproof tarpaulin fabric. Side mesh water bottle pocket. External Hypalon gear loops. Airmesh padded shoulder straps with removable sternum strap and whistle buckle. Sizes: 28.75′ [H] X 12.5′ [W] X 8.5′ [D]. Customer Service is at our core. We’re here to help you find the best products to suit your needs. We stock not only wetsuits but all essential watersports clothing and equipment. From UV Rash Vests for sun protection, to wetsuit and drysuit for thermal protection.