Mammut's Haldigrat 30 E2 Airbag backpack runs on the Alpride E2 airbag system, an electronic setup powered by supercapacitors instead of a gas cartridge. That construction lets this avalanche airbag pack deploy at full pressure in freezing temperatures without waiting on a canister refill, and it clears airline safety rules for backcountry ski trips that involve a flight. A recycled 420D Nylon Oxford HD shell and a U CONTACT U Frame handle load transfer on the climb, while 30L of capacity carries skis, a splitboard, or snowboard gear for the way down. What Our Gearhead(R) Experts Are Saying:"I've had gas-cartridge airbags balk on me on cold trailhead mornings, and that's exactly the scenario the Alpride E2 supercapacitors were built to solve. Rechargeable power that ignores the temperature outside keeps one less variable running through my head on the skin track."