The Black Diamond Microns Mini Carabiner is an itty bitty little carabiner for non load-bearing use. Straight from the makers of real climbing equipment, but NOT FOR CLIMBING USE. You can totally hook one to your belt loop though so you don't lose your keys. Or clip a few of them to your backpack, securing a water bottle or maybe a travel tube of sun screen to the outside for quick access. Hey, I bet you could even use one to somehow help you secure a bear bag. Last I checked bears can't use carabiners.
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