Outdoor Research Helium Bivy Waterproof Insect-Proof Lightweight Bivouac Sack Tent, Cenote

Outdoor Research Helium bivy in Cenote for compact overnight shelter

A lightweight bivy sack with waterproof Pertex Shield fabric, insect-proof mesh canopy and a single-pole setup for compact overnight shelter.

The Helium Bivy is a bivouac sack from Outdoor Research designed for nights when you want a small, simple shelter rather than a full tent. The Cenote colourway keeps the listing specific to this version, while the overall design focuses on keeping weight and bulk down.

Materials and construction

The shell uses Pertex Shield Diamond Fuse 2.5L, with a 100% 30D ripstop nylon face fabric, a 100% 40D nylon floor, TPU coating, and 100% polyester mesh. The listing also notes a bluesign APPROVED responsible collection for the membrane and mesh.

Ventilation and bug protection

A no-see-um mesh canopy is included to help keep insects out while still allowing airflow. That makes it a better fit for trips where you want a more enclosed sleep setup without losing ventilation completely.

Setup details

The bivy uses one pole with a Delrin single-pole system. That keeps the structure simple and in line with the stripped-back nature of a bivy bag rather than a larger tent.

• Lightweight bivy sack style shelter
• Waterproof Pertex Shield membrane and laminate
• Insect-resistant no-see-um mesh canopy
• Single-pole design for a simpler setup
• Bluesign APPROVED membrane and mesh

For shoppers comparing bivy bags, this model makes most sense when compact size, weather protection and bug coverage matter more than interior space or tent-style comfort. The main trade-off is straightforward: it is a purpose-built bivy, so the living space and headroom will be more limited than in a tent.