Rab Syclon XP 40L Backpack Ain't No Mountain High Enough Every gram matters on the trail, and the Syclon XP proves that ultralight doesn't mean cutting corners. Weighing under 900g yet fully waterproof and IPX4-tested, this pack eliminates the need for rain covers or dry bags-making it the ultimate choice for minimalist hikers, alpine hut-hopping, and long-distance trekking. The body-contouring AEROFIT carry system keeps you comfortable at speed while the waterproof construction with taped seams protects your gear in anything the mountain throws at you. Features Fully waterproof main compartment with IPX4 rating and taped seams keeps all gear dry in heavy rain without extra dry bags or rain covers AEROFIT carry system with ventilated, body-contouring back panel provides stable, close-fitting support and airflow for fast-paced, long-distance missions Smart storage organization with roll-top entry, zippered rear hydration compartment, front stash pocket, hipbelt pockets, and trekking pole attachments SPECIFICATIONSIntended Use Backpacking, Thru-Hiking, Alpine Hut-Hopping, Trekking Capacity40LMain Fabric40D high-tenacity nylon (100% recycled)Secondary Fabric100D high-tenacity nylon with Spectra(R) Ripstop (85% recycled)Lining210D nylon (100% recycled)Back System AEROFIT(TM) with ventilated, body-contouring design Back Length19-20" (Medium-Large)Waterproofing IPX4-rated with fully taped seams Roll-Top Entry Expands and compresses with load Pockets Rear hydration compartment, front stash pocket, side water bottle pockets, hipbelt pockets, chest strap storage Attachments Trekking pole carry points Weight1 lb 15. 3 oz / 890g | Rab | Syclon Xp 40L Backpack | Nylon