For a lightly loaded day pack, determining the exact back length is not absolutely crucial. With trekking or mountaineering backpacks, however, it is essential, as only a perfect fit will efficiently transfer the weight to the hips. With heavy loads or backpacks featuring an internal carrying system, the centre of the hip wings should ideally rest on the iliac crest and the rear pad on the sacrum.
How do you measure back length?
To determine the back length, use a tape measure to measure the distance between the base of the shoulders or the level of the 7th cervical vertebra (which you can feel protruding where the neck meets the spine) and the upper edge of the iliac crest.
The Lightning, Ridgeline and Skyline rucksacks are fitted with a unisex carrying system. They offer two adjustable back lengths: S | M and L | XL.
Black / L/XL
Ultralight, comfortable backpacking pack with roll-top closure
innovative, customisable T-Rex carrying system
efficient packing volume management
ultra-light ripstop nylon with reinforced base
Product Description
With its ultra-lightweight construction and adjustable back system, the Lightning was developed for trekking tours where low weight and high carrying comfort are crucial.
The innovative T-Rex carrying system with reduced contact points ensures effective ventilation and freedom of movement. The back length can be precisely adjusted, while the efficient load transfer to the hip belt ensures a stable and comfortable fit even with a heavier pack weight.
Sophisticated pack volume management allows flexible adjustments. The zig-zag compression straps are easy to adjust and, together with the roll-top fastener, allow variable volume control. They also secure larger equipment such as a sleeping mat or flysheet. Generous mesh outer pockets, zipped pockets on the hip belt and modular attachment points support clear organization.
Made from ultra-light ripstop nylon with a reinforced polyester base, the Lightning combines minimal weight, durable performance and well thought-out design.
Volume
50 l
Min. Weight
S/M: 40.7 oz L/XL: 42.7 oz
Max. Weight
S/M: 41.8 oz L/XL: 43.7 oz
Load limit
48.5 lb
Dimensions
27.5 x 13.7 x 9.8 in
Shell Fabric 1
210 D HD ripstop nylon PU coated 1000 mm water column bluesign® approved fabric
Shell Fabric 2
recycled 600 D 82T Polyester PU coated 1500 mm water column bluesign® approved fabric
Frame
6061-T6 aluminum stay
Product with Climate Contribution
EXPED calculates all climate emissions from the production and transportation of this product and finances certified climate protection projects through myclimate to an equal extent.
More and more EXPED products are made from recycled materials. Materials gained from previously made materials -such as PET-bottles or waste from the production of textiles.
Bluesign approved fabric
Bluesign® is the world's strictest textile standard for environmental and consumer protection in the textile industry. All materials of this product which are accordingly labelled are manufactured and approved according to the bluesign® standard.
All EXPED textile products are made without intentionally added PFAS since 2025. We work closely with suppliers and perform independent tests to ensure our products contain zero PFAS.
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