The Little Brother pack is a handy, stand-alone pack that's sold as part of the Eberlestock J79 Skycrane II system, and made to complement J51 Warhammer packs. The G1 features an expansion tunnel that allows you to insert any of our side scabbards (sold separately). With our A4SS Tactical Weapon Carrier installed, the pack functions much like our G3M Phantom. The pack features both top-loading and full-front panel loading. MOLLE/PALS webbing fills all useful spaces inside and out. There are two hydration sleeves on interior back wall sized for our WXP3L 3-liter bladders. A radio rack on back wall holds PRC-117 class military radios. The G1 comes with a harness. You can add our HBSS Hipbelt accessory if you want a supportive pack belt. We offer two frame systems to add structure to this otherwise un-structured pack: The Endo frame slides into the pack's main load bay, adding both vertical and lateral structure without compromising comfort or the pack's quiet ride. Alternatively, if you're not planning to carry a scabbard, the polycarbonate AG2S Gossamer frame fits into the scabbard tunnel when it's zipped closed. Either option provides a simple and effective way to convert the G1 into a compact, structured internal frame pack.