The Eberlestock Transformer Pack is a lightweight, versatile pack that can stand alone, or can be piggy-backed on the Mainframe. With a full-featured layout that includes both top and front access, and two full-depth side pockets, the Transformer is made to appeal to those who are looking for Eberlestock quality combined with stripped-down, minimalist weight savings — while maintaining just enough functionality to stand as a great all-around pack.When using the Transformer as a stand-alone pack, we recommend adding their Endo frame, which attaches to the interior back wall of the pack via small Velcro keeper-straps. You can also add one of their hip-belts, or use the one off of the Mainframe, if you’re using the packs as a set. Don’t let all of the options confuse you; this is a very straightforward and versatile system with a unique and practical kind of modularity. You can build the pack that best suits your needs, or a system that allows you to pick-and-choose based on the demands of the moment, with each option providing a seamless functionality.Feature List(6) Side compression straps. When combined with the Mainframe pack these straps will compress and hold quarters, duffels, and any other gear you need to carry.Long side pockets. Big enough to hold 3L hydration systems and spotting scopes.Front compression straps.