OP here is the cheaper backpack I mentioned. Looks like it would cover your needs if price is the only thing holding you back from a backpack.
https://www.dynamicdiscs.net/Dynamic-Discs-Sniper-Backpack-Disc-Golf-Bag-p/4986.htm
https://www.dynamicdiscs.net/Dynamic-Discs-Sniper-Backpack-Disc-Golf-Bag-p/4986.htm