Pro Eagle Backpack Mossy Oak Break Up Country. The Fieldline Pro Series Eagle Backpack is a mid-size day pack designed to carry the essentials for scouting and stalking. Itâ??s constructed of durable polyester camo fabric and has a fully padded back panel that allows air to pass between you and the pack keeping you cool and dry. Contoured shoulder straps, adjustable sternum strap, and side compression straps balance the load for a comfortable day in the field. Four external storage pockets and a front mesh stash pocket hold all your essential hunting equipment in an organized and secure manner. The bottom pocket has a built-in organizer and cell phone holder. Large zipper pulls make getting to your gear fast and easy. Side expansion pockets are great for storing extra gear. Hydration compatible.