Outdoor Research Interstellar Bivy - 3-Layer Waterproof Breathable Fabric

Utilizing 3-layer AscentShell™ waterproof-breathable fabric, this bivy sack effectively blocks external rain and wind while allowing internal moisture (sweat and breath vapor) to escape. It achieves tent-like livability in an ultra-lightweight and compact package. This model is highly recommended for hikers and backpackers focused on ultralight (UL) gear who want to minimize their load.

Basic Specifications
- Compatible Seasons: 4-season
- Material: AscentShell™ (3-layer waterproof-breathable fabric)
- Floor: 40-denier ripstop nylon (TPU laminate)
- Weight: Approx. 650 g (includes included poles; can be lightened by removing poles)
- Overall Length: Approx. 82 inches (approx. 208 cm)
- Packed Size: About the size of a 1L bottle (extremely compact)
- Features & Functions
- Hoop pole at the head creates space around the face for improved breathing and ventilation.
- Side entry design allows for easy entry/exit and gear access.
- Sombrero flap + zipper provides protection and blocks wind/rain when seated.
- Independently opening/closing mosquito net (convenient for stargazing or during insect season).

Usage Frequency & Condition
Used a few times as an emergency bivy, then stored at home. Overall in good condition. However, small bubbles due to hydrolysis are visible on a portion of the thin seam tape (this is an external degradation, and while no significant decrease in waterproofing performance has been confirmed at present, please understand this is a used item).