[smileysteve]

Brag, I've been reusing the same backpack from high school for over a decade. It carries about 30l or 16lbs of fluids, I've had the zippers repaired once, and I probably use it at least one a week.

[lstodd]

This. I shop with a 10 year old Deuter, and although it looks worn, I expect it to last at least another 10 years.

It is also healthier for your spine than an equivalent bunch of bags, and keeps hands free. What's not to like?