At Office Max starting this Sunday, July 24, 2011 you can get up to 2 backpacks for 100% FREE!!! Office Max will be giving 100% Maxperks Bonus Rewards on backpacks via their MaxPerks rebate program! ***The rebate comes comes in the form of store credit good only at Office Max. This is a great way to get the things your kids need for school and save money at the same time! Fine print on this offer: Limit 2 per member. While supplies last. Bonus Rewards earned for this backpack offer will be available in a member’s account in September 2011; Bonus Rewards for Teachers Members will be available in October 2011.…