Very poor zipper. The fabric around the zipper stretches, it closes badly, and then a hole forms. My friends and I bought three identical backpacks, and everyone has the same problem. Soon it won’t be usable, and I’ve only had mine for 3.5 months (I use it on weekends and for travel). For this kind of money, they could make the zipper a bit stronger; after all, it’s Military, yet it didn’t withstand city life and one trip.