Lifetime warranty. No questions asked. I have new wheels put on mine about once a year. Costs $15 for shipping and they will fix everything. Last time they replaced the zippers.
http://www.briggs-riley.com/travel/carryonwheeleduprights/321_22quotcarryonsuperlightupright.asp
http://www.briggs-riley.com/travel/carryonwheeleduprights/321_22quotcarryonsuperlightupright.asp