My Beckman Panniers are now over 25 years old. I use them on my BG RNR and Fat Chance Mountain Tandem for touring. The zippers, mounting hardware and cordura materials have demonstrated exceptionable durability with hard usage much of which has been off pavement in North and South America. I have lubricated the #10 YKK zippers with silicone once after 20 years. For the long haul they have also been inexpensive when amortized over the years of use.