3F UL Gear Tyvek Bivy Bag
A light Tyvek cover that slips over a mummy sleeping bag or quilt to keep tent condensation, dirt and light splashes off the bag, and to trap a little extra air for warmth.
Choose Type A without a zip (about 135 g, quilt-friendly) or Type B with a zip (about 200 g, mummy bags). It is water-resistant rather than a full storm shell — use a tent or tarp in heavy rain. See 3F UL Gear.
Key features
- Breathable Tyvek fabric
- Protects sleeping bags from condensation and dirt
- Adds a little insulation by trapping air
- Zip or no-zip options
- Compression sack included
Specifications
| Type A (no zip, quilt) | About 135 g; about 180 × 145 cm; packed about 16 × 8.5 cm |
| Type B (zip, mummy) | About 200 g; about 230 × 90 cm; packed about 16 × 8.5 cm |
| In the box | Bivy + compression sack |
You may also like

