I have two old Jansport Back packs that I use,
One is green the other Camo.
What I like it the large central pouch and the double zippers
the two side pockets are large and carry stuff easy to get to.
The center pocket in it allows for other easy items to retrieve easy.
I like the straps and the tie downs. There are two tie downs on the bottom of the Green one where I connect my Dead Slead drag. The loop between the back straps allows me to hang it on the tree or in the stand.
And the tie downs on the top are a place to roll of camo or a blanket. Old wool army blanklet works well as cover, warmth, and a strecher if needed with a couple of poles to drag out buddy or game.
In the side pockets I keep Toilet paper, hand wipes, toosh wipes, rubber gloves, spare knife, fire making, small 1st aid kit, a couple Zip loc bags. Twine, Water, usually a diet coke, and a snickers bar..
In the center pouch I keep spare gloves, a warm hat, a balaclava, boot covers, and some times a sweater.
The center pocket on the back usually has lunch and some snacks as well as my hunting license and tags.
Inbetween the side pockets and the main compartment are places for skis. When I was a kid on a bike going to school I stuck my lacrosse stick there (had the same pack as a kid in school- It was red). Now I put 50' of 3/8" nylon rope in a hank and tie it to one of the attachment points on the top.
The other side has carried a hatchet. But often it has held my rifle when draging out a deer.