I don't do many day hikes. When I use a pack it's usually for an overnite trip. My favroite pack is the Kelty Redwing. I carry my sleeping bag, pad, cooking gear, food, water bottles (two), first aid items/meds, survival kit, extra socks/underwear, trash bag, stove, inside the pack. Strapped on the outside is my tent and tarp. Side pockets, axe and a large knife. I carry a saw, usually folding inside the pack along with a flashlight/headlamp. Other small items for fire starting in my pockets. I may have missed a few things but that is the basics.