Columbia says they have a lifetime warranty, but a $300 running rain jacket I bought at their flagship store sometime ago they refused to repair or replace it when all of the inner liner started flaking off and it was no longer usable. I'm never buying anything from them again.

The most durable day-bag / school backpack I have ever owned was a Trager. It was needed because I went through 9 backpacks in high-school since our school didn't have lockers. Supposedly in the 70's pipe-bombs were detonated in them and the lockers created shrapnel. Anyhow, that backpack held 4-6 books like a champ. It had/has a lifetime warranty and they even replaced the zipper on a 10 year old product for free. Sadly, they're out of business now.