The Zippy is Hyperlite Mountain Gear's small waterproof storage pouch, made from Dyneema Composite Fabric 1.3 and sealed with a waterproof zipper — a simple way to keep electronics, a first-aid kit or other small essentials dry and findable inside a larger pack. It comes in three sizes ranging from 1 to 3 litres and 17 to 21 g; the clear colourway listed here weighs 19 g, putting it in the middle of that range.
Because DCF does not stretch or absorb water, the pouch holds its shape when packed and adds negligible bulk to a kit list built around gram-counting. It is not a stuff sack for bulky items — the appeal is purely organisational, separating small gear that would otherwise get lost loose in a main compartment. For thru-hikers and ultralight backpackers managing multiple small pouches (electronics, meds, repair kit), the Zippy's clear face also makes contents visible without opening it, which matters when digging through a pack in the dark or rain.