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The bottom of the bag is reinforced by two rails
The Evo Ultra Light is an excellent choice for super lightweight trips in temperatures above +8°C
and an easy-on elastic waist
and so much toughness built right in
From crags to cafes
Outdoor Research Helium UL Bivy Aspire The bottom of the bagThe Helium UL Bivy is built for ultralight backpackers, climbers, and fast packers who need waterproof protection and breathability in a minimalist shelter. Made with bluesign approved Pertex Shield NetPlus fabric from 100% recycled nylon, the Helium UL Bivy is newly updated for 2026 to deliver durable, lightweight performance with a fully seam taped design and waterproof PU coated floor for reliable weather protection. Dual passive ventilation flaps
