There was a link to Kickstart page posted here awhile ago of a hockey bag development. It looked pretty interesting. Backpack strap, lots of compartment - what you're looking for.
Either way, sounds like you're pretty sold on Pro15. Why not just get it? Asking here, you'll likely get the responses 1) Warrior pro bag is awesome, 2) Grit tower is OK, and 3) Bauer bags have durability issue and some variations of it. You want to get Pro15. Sounds like we're not going to change your mind.