As far as anything you purchase from Amazon goes, quality is always going to be a gamble. They do carry some 5.11 gear, which in my opinion is going to be your best bet, and with only two weeks to spare you're going to have to purchase something immediately so that you can get it in your hands before you have to depart. I've had one of these 5.11 Rapid Origin rucksacks before, although I never used it for rucking it did seem fairly sturdy and I'm sure that it would last you a while as well as be more comfortable than what you're currently using to ruck with. It's going for $85 right now, and sometimes even cheaper and available on other websites. Good luck and ruck on.