Description Refined down to the most essential features, Lightning 50 is a lightweight, comfortable pack designed for multi-day backpacking adventures. The 50L pack capacity is ideal for extended weekend trips (2-4 nights) or ultralight thru-hiking adventures in warm weather. Trusted by backpackers and thru-hikers, Lightning features a large roll-top opening, a height-adjustable comfort suspension system with minimal back contact points for great ventilation, a full pack compressions system, and more storage and gear attachment options than previous Lightning models. Features Front & side compression system shrinks pack size or expands to allow more room. Height-adjustable T-Rex frame suspension system with aluminum stay & stiff cross top piece provides excellent load control while still flowing with your movement. Numerous external pockets (including 2 stretch water bottle pockets, stretch front pocket & zippered top lid pocket) & attachments points provide ample options for securing gear. Comfortable padded hip belt with zippered pockets supports load control & weight distribution. Rolltop closure provides an extra-wide pack opening; a top zipper provides quick access to gear & essentials when the rolltop is closed. Load control straps ensure a comfortable, custom fit. Specifications Volume: 40 L Dimensions: 27.6 x 13.8 x 9.8 in Min. Weight: S/M: 2 lbs 8.5 oz / 1148.16 g, L/XL: 2 lbs 10.5 oz / 1204.85 g Max. Weight: S/M: 2 lbs 9.5 oz / 1176.51 g, L/XL: 2 lbs 11 oz / 1219.03 g Torso Length: S/M: 17-20 in, L/XL: 19-22 in Load Limit: 48.5 lbs / 22 kg Materials: 210D HMPE ripstop nylon, PU coated, 1,000 mm water column (Main Body), Recycled 600D 82T polyester, PU coated, 1,500 mm water column (Bottom), 6061-T6 series aluminum stay (Frame)