MSR Pro Bivy Mummy Sleeping Bag, Orange, Nylon and Ripstop

The MSR Pro Bivy is a lightweight mummy-style sleeping bag cover engineered for alpine climbing and minimalist backpacking. Constructed from durable nylon with a ripstop weave and a specialized polyurethane coating, this bivy sack provides essential protection against the elements while maintaining a compact profile. Weighing only 280 grams, it is designed for mountaineers and outdoor enthusiasts who require reliable, quick-pitch shelter in challenging environments where a traditional tent cannot be used.

Advantages

This bivy sack is exceptionally lightweight, making it an ideal choice for fast-paced alpine missions and technical routes where every gram counts. The integration of breathable, weatherproof fabric significantly reduces internal condensation, ensuring a drier and more comfortable sleeping environment. Furthermore, the inclusion of Xtreme Shield waterproof coating offers superior durability, lasting up to three times longer than standard protective coatings, which enhances the longevity of the gear in harsh conditions.

Suitable for

• Alpine climbing and mountaineering
• Minimalist backpacking and fastpacking
• Emergency shelter in technical terrain
• Sleeping in cramped spaces where a tent does not fit

When it may not be suitable

The MSR Pro Bivy may not be suitable for individuals who require the living space, gear storage, or social comfort provided by a full-sized tent. It is designed primarily for minimalist protection and does not offer the same level of ventilation or interior room as a standard camping tent.

Key specifications

• Dimensions: 2240 mm length by 910 mm width
• Weight: 280 g
• Material: Nylon and ripstop fabric
• Coating: Xtreme Shield polyurethane
• Design: Mummy-style bivy sack

How to use

To use the MSR Pro Bivy, simply unroll the sack on a flat, cleared surface. Slide your sleeping bag inside the bivy, then crawl in and secure the closure system to seal out the elements. Ensure the ventilation areas are positioned to allow for airflow while preventing moisture ingress. When packing, fold or roll the bivy tightly to fit into its storage bag, ensuring it is completely dry before long-term storage to maintain the integrity of the waterproof coating.

What to consider before purchase

• Assess whether the minimalist mummy design meets your comfort requirements
• Verify that the dimensions are compatible with your existing sleeping bag and pad
• Consider the environmental conditions of your planned trips

Usage recommendations: Always clear the ground of sharp debris before setting up your bivy to prevent punctures. If possible, use a footprint or ground sheet to provide an extra layer of protection for the base of the bivy.