Alpine Routes. Ski Touring. South American Vacation. The Big sky is possibly the most versatile pack of our Adventure line. The signature 3Zip design opens the top and front of pack wide to easily load awkward items like a rope, rack of cams or Pelican Case. You can then zip the pack closed around the load instead of trying to finagle these items through a shroud. This feature allows the Big Sky to be loaded more like a suitcase than a pack. Plus, the Live Wing waist belt can be folded into the sides of the pack – perfect for traveling. It’s no secret that the Big Sky is a favorite of the employees here at The Ranch.