It's one thing to have power. And it's another to have it in a compact design that is easy to pack, light to carry and expandable to fit changing power needs. The Sherpa 50 takes the bulk out of rechargeable power and offers a lightweight yet durable way to bring power along with you. Less than two pounds, it's the ideal shape to pack in everything from backpacks to panniers to laptop cases, yet rugged enough to withstand abuse. Charge it from the wall, solar panels or car adapter and add other Sherpa power packs and inverters through a simple stacking and unique cord chaining method to expand your powering abilities and options. 50-watt hours of Power Pack storage capacity. Wt: 2.2 lbs.