WIsh I could like it

I received this backpack for last Christmas (bought from Amazon). Its a nice backpack, except that the main compartment's zippers stick in 2 areas, making it a hassle to close. I was hoping that if I continued to use it the zippers would begin to loosen and flow more smoothly, however that has yet to happen. Other than this problem, I have no problems with the backpack, but like I said, the whole zipper thing is a pretty big annoyance.