What is your oldest piece of gear still in use?

[kickatree]

Oh a Jansport Denali external frame pack. I think it is 80L.

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[Viper2016]

The Svea and Sigg cookset still travel, early 70s. The Jansport day pack that was my original backpack has disappeared, I just wish I could pack as little now as I did then, or justify the expense of going lighter; I just bought a
Ti pot, maybe times are changing.

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[FlyFishNut]

My dad's Marine Corps issue canteen cup, has 1966 stamped on it.