Whatever situation you find yourself in, the GRAVELLY 18 has you covered. Attach it to your frame, attach it to your pack, or carry it by itself. The GRAVELLY 18 is three packs in one: It&';ll securely "piggyback" to your main bag adding 18 more liters of capacity for critical gear. Or attach the GRAVELLY 18 to the frame and use the compression straps and Overload Shelf as a meat hauler while also carrying the essentials with you. Lastly, with stowable straps, it works as a stand-alone pack for a quick stalk or glassing session. Key Attributes Works with our ULTRA LIGHT MT(TM) frame OVERLOADA(R) feature provides functional expandability via a load sling between the pack and the frame, allowing you to put the bulk of the weight closest to your back for optimal comfort. Features Stowable shoulder straps to go from backpack mode to securely attaching it to your main bag adding 18 more liters of capacity for critical gear Compression straps secure your load for navigating the nastiest terrain Two water bottle pockets ensure you stay hydrated Blaze orange frame tabs allow for easy attachment or detachment A zipper secured front pocket gives you easy access to your most important items Materials YKKA(R) zippers 330D LP CORDURAA(R)