The R3 5900 is a highly versatile and lightweight backpack designed for diverse missions. With the ability to execute light-and-fast, one-day operations in Bivy Mode and extend instantly into a multi-day pack with a 2,500 cubic inch load shelf, it offers flexibility for various scenarios. Integration with R3 Side Bags further enhances its capabilities, accommodating extended missions with additional equipment or cold-weather gear. The backpack features top Velcro access for a radio antenna, internal Velcro loop patches for modular storage, and a convenient side stretch pocket. The color-coded buckles on the R3 Frame facilitate quick attachment and separation, allowing for efficient utilization of the load shelf. Moreover, the integrated heavy weapon system on the frame provides secure and supported carry for long-range large calibers with large optics. In summary, the R3 5900 is a well-designed and adaptable backpack catering to a wide range of operational needs. Features of the R3 5900 Pack: Compatible with R3 Lid (included) Top Velcro access for radio antenna and or comms cable Two internal Velcro loop patches Compatible with SG Camp Pocket, Swing Out Pocket, and other modular attach pockets Side stretch pocket for quick external storage Full top panel zip for access to main compartment Top external zipped pocket Belt attachment compatible Hydration Compatible (Hydro Sleeve - Sold Separately) Stone Glacier R3 5900 Pack w/R3 Frame Coyote 50096-CY