Rab Trailhead Bivi waterproof bivy bag

Rab Trailhead waterproof bivy bag for lightweight shelter

A lightweight, breathable bivy bag in waterproof ripstop nylon with 10,000mm hydrostatic head and fluorocarbon-free DWR.

The Rab Trailhead Bivi is a simple, lightweight bivy bag made from waterproof ripstop nylon. It uses a 40D ripstop nylon top and base with PU coating, plus fluorocarbon-free DWR, so the fabric is built to handle wet ground and damp conditions while still remaining breathable.

With a 10,000mm hydrostatic head and MVTR 10,000 g/m2/24h on the top, this bivy is aimed at people who want a compact shelter layer without unnecessary bulk. The base is also rated to 10,000mm HH, which adds a useful level of weather resistance where it matters most.

Key fabric details

• 40D ripstop nylon with PU coating on the top and base
• Fluorocarbon-free DWR finish
• Waterproof construction with breathable performance
• Top fabric rated to 10,000mm HH and 10,000 g/m2/24h MVTR
• Base fabric rated to 10,000mm HH

Who it suits

This is for buyers looking for a straightforward bivy bag rather than a feature-heavy shelter. The focus here is on low weight, packability and weather protection from the fabric specification, so it makes sense for minimalist overnight use where a bivy is the right format.

Because the listing only gives fabric and waterproofing details, there is no need to expect extra features beyond the basic bivy design. That makes it easier to judge on the main priorities: material, breathability and water resistance.