I grew up midwest hunting. And by that, I mean dragging field dressed game. As did my step dad. His dad. So on and so forth.
A bag, and a cheaper bag, is akin to your math, science and history book in you jansport.
Will it work, sure.
Internal frames (good ones) are a huge improvement over the jansports. External more so.
I won't ever make my kids drag a deer as is midwest tradition. Screw that noise. I'll buy them real internal framed packs long before I let them haul anything in some gugamechi bag.
I've found the MR glmt frame to work great for me, sg and so didnt fit, exo and kif i never made it to as MR fit. Had a custom bag(s) made for the frame. Now I rock my glmt + 65l sts bag in my custom meat shelf.
Tldr-get a real frame pack with meatshelf of any variety. The rest you can tweak. Don't beat up your kids as a crappy bag will lead to a crappy time and potentially lead to a crappy hunting partner who may decided to become a fly fisher instead.