Sierra Designs Backcountry Bivy

It is fully waterproof. The top fabric is constructed from 20D Nylon Ripstop WPB (Waterproof Breathable), and the floor features a 30D Nylon Ripstop material with a 10,400 mm waterproof rating. All seams are factory sealed to ensure you stay dry in wet conditions.

No, it features a poleless design to keep your pack weight to a minimum. It is designed to lay flat over your sleeping pad and bag, though it does include a guy line loop if you want to lift the fabric off your face for extra headroom.

The Regular size fits users up to 6 feet tall with floor dimensions of 80" x 36", while the Long size accommodates taller users with an 86" x 40" footprint. We recommend choosing the Long if you use a thicker, high-loft sleeping bag or a wider sleeping pad to ensure you have enough room to move without compressing your insulation.

Yes, it is designed as a standalone minimalist shelter. However, because it is a single-wall system, condensation can build up inside during cold or humid nights. The mesh window panel helps with ventilation, but it is best suited for fair-weather trips or as an emergency shelter.

The bivy is designed to be used as a sleeve for your sleep system. You can slide your sleeping pad inside the bivy or place the bivy over your pad and bag, depending on your preference for how you want the fabric to sit against your body.