Exped Lightning 40 Backpack Reduced to what matters. The Exped Lightning 40 was developed for trekking tours where low weight and high carrying comfort are non-negotiable - and it's been recognized as the best backpack of 2026 by Outdoor Magazine's editors. At 40 liters, it's the go-to for fast-and-light weekend trips or ultralight multi-day adventures where a smaller, nimbler pack is an asset. The innovative T-Rex carrying system features an adjustable aluminum stay with reduced back contact points, ensuring ventilation and freedom of movement without sacrificing load control. Roll-top closure, zig-zag compression straps, stretch pockets, and modular attachment points keep things organized and dialed in. Built with bluesign(R)-approved, PFAS-free fabrics. Features Height-adjustable T-Rex frame suspension system with 6061-T6 aluminum stay and stiff cross top piece provides excellent load transfer to the hip belt while naturally moving with you on the trail Minimal back contact point design promotes airflow and reduces heat buildup, keeping you cooler and more comfortable on long days Roll-top main closure provides a wide-mouth opening for easy access and flexible volume control - close it drybag-style for weather protection, or cinch vertically to compress your load Zig-zag front and side compression straps quickly fine-tune pack volume and double as attachment points for a sleeping mat, tent fly, or other bulky gear Numerous external pockets and attachment points including two stretch water bottle pockets, a large stretch front stash pocket, zippered hip belt pockets, and a shoulder strap pocket Trekking pole attachment and modular daisy chain loops for securing ice tools or additional gear on technical objectivesbluesign(R)-approved, PFAS-free fabrics with recycled materials incorporated throughout, backed by a 5-year warranty and Exped's climate contribution program SPECIFICATIONSVolume40 LDimensions25. 6 x 12. 2 x 9. 1 in Min. Weight S/M: 2 lbs 7. 5 oz / L/XL: 2 lbs 9. 5 oz Max. Weight S/M: 2 lbs 8. 5 oz / L/XL: 2 lbs 10 oz Load Limit48. 5 lbs Torso Size S/M: Short/Medium / L/XL: Medium/Long Torso Length S/M: 17-20 in / L/XL: 19-22 in Frame T-Rex system - 6061-T6 aluminum stay with stiff cross top piece Shell Fabric210D HMPE ripstop nylon (PU coated, bluesign(R) approved) / Recycled 600D 82T polyester (PU coated, bluesign(R) approved)Closure Roll-top with top zipper quick-access Warranty5 years Intended Use Backpacking, Thru-Hiking, Mountaineering | Exped | Lightning 40 Backpack | Nylon