I've never had a Jansport backpack last more than 6 months, but maybe I was buying the school-oriented ones and not the outdoor ones? I've gone through at least 10 in my life because my grandma would buy them for me every year.

I've only had mine for a year, but it's literally the only backpack I've ever had that's lasted an entire year. It looks good as new. I have faith it's gonna hang in there for awhile!