The SOG Ignition Day Pack has a roomy main compartment with a large zippered opening to give you plenty of space for all your needed essentials. It is hydration compatible but a reservoir is not included in the backpack purchase. You can utilize the outside MOLLE straps to attach other gear you may need whether on your hunting trip or in the airport. The side compression straps will ensure you have a comfortable carry even if the backpack is fully loaded.