Bottle Sling: Hawaiʻi Volcanoes National Park

Very good. Allows me to be hands free while hiking

Hawai'i Volcanoes National Park Bottle Sling

I love this sling! It has so much style, and I'm proud to be seen sporting the logo of my beloved Hawai'i Volcanoes National Park. The sling fits many sizes of bottle -- and I heartily recommend you bring a refillable one to the park or wherever you and your sling go. Excellent quality product, made of recycled material, probably plastic bottles! The secret pockets are a nice touch, too. One of them converts to a pocket into which you can fold the sling when not in use. It even has a carabiner to attach it to your backpack.