When I previously worked in a camera store, Lowepro used to replace worn zipper/bags for free with a new one. In Canada, most Lowepro bags have a life-time warranty.
Don't know how much wear you have....You might stop by a Jeep dealer and buy a bottle of Mopar zipper cleaner/lube. It works great on my soft top window zippers, and I use it on my camera bags zippers.
It is some pretty amazing stuff. $9 or $10 a bottle.
Wow, I'm sure glad that I heeded everyone's advise and contacted Lowepro! I sent my pack in yesterday by UPS and I just received an E-mail from Lowepro saying that they were going to replace my pack with its replacement the Pro 400AM Trekker!
I can't say enough about this company. I have two of their packs for years and both have served me well. (They said that they replaced the zipper on the model I had with a heavier zipper before they discontinued the model.)
If you're in the market for a photo backpack, you can't go wrong with Lowpro!
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