Outdoor Research Helium Bivy in Cranberry, One Size

Ultralight bivy shelter for fast-and-light nights

An ultralight bivy shelter with breathable, seam-taped construction and a clamshell opening for fast-and-light nights outdoors.

The Outdoor Research Helium Bivy is a compact shelter for nights when keeping weight down matters. In Cranberry and One Size, it combines nylon, TPU and polyester with a Helium fabric build, giving you a bivy that is made to be light to carry and straightforward to use.

Built for simple, weather-ready shelter

This bivy features fully seam-taped construction and is described as waterproof and breathable. That makes it a practical choice for trips where you want a low-bulk shelter without adding unnecessary weight or fuss.

• Clamshell opening for quicker entry and exit
• Ultralight Helium fabric for fast-moving trips
• Reflective logo and trims for added visibility
• Made with nylon, TPU and polyester

What to keep in mind

This is a bivy bag rather than a full tent, so it suits hikers and adventurers who already know they want a minimalist shelter. The One Size fit and streamlined design point towards simple use on fast-and-light missions rather than roomy campsite comfort.

If you are comparing bivy bags, the key things here are the lightweight build, seam-taped construction and clamshell access, all wrapped up in a very stripped-back shelter format.