My favorite hunting day pack is a Eberlestock X2. It is very comfortable and large enough to get my ghillie suite, extra clothes, water and any supplies I'd need if hunting away from camp for the day.
I always carry an extra knife or two...but some times I have to dig deep to find one. Not any more...I think my Tippit Pack Knife Sheath should keep one handy
Flat leather back is laced into the webbing straps of the pack with paracord... Doc