I have run with a pack most days for the past 10 years and have tried many brands (REI, Osprey, Berghaus, Golite, others). The Terra Nova Laser 20 is the least durable pack I've ever had. Pack failed with a broken zipper after 3 months of use. Since the zipper runs the length of the pack if you have a zipper problem your pack is basically useless. Customer service from Terra-Nova was unresponsive and unaccommodating.