This sling bag is very nice for essentials, its quick release metal clasp buckle allows you to quickly throw and go while hiking in the park. It has a main compartment with a divider inside, battery charger, passport, sunglasses case, sunblock, small water bottle and some snacks. Also it has a front pocket for easy access cash, phones and wipes. They all are zippered that will keep the things dry in case you spill some water or rains a bit on it.