The Sky 5900 has a large front panel zip that lets you easily access everything inside your backpack, so you can quickly snag whatever you need. Its clever design also includes a 22-inch vertical pocket for a spotting scope, an expandable load shelf that adds 2,500 cubic inches of storage, and large external pockets perfect for a water bottle. While the Sky 5900 already offers 4,300 cubic inches of room, you can add the Sky Lid for additional storage. Sky 5900 Features: 5,400 cubic-inch main bag Hydration compatible Full panel zip Front zipped pocket 150+ pound load rating Hydration compatible 2,500+ cubic inch expandable load shelf Cordura 500 and Xpac fabric Note: This product contains PFAS chemicals and can not be shipped to California or New York Stone Glacier Sky 5900 Pack w/Krux Frame Tan 50138-TN, Small