After nearly 9 years, it's in perfect condition, and one of my most cherished possessions. I'm not one to anthropomorphize... but this one bag is my best friend. It has quite literally been with me through everything.
Also, a good bag has got to be the most underrated item in any apocalyptic scenario. Travel and scavenging become the primary methods of survival - a strong, sizable bag allows you to securely store food, water, medicine, ammo, tools, printed and digital media. A zipper breaking as you flee from danger may make the difference in survival.