3F UL Gear Tyvek Bivy – Waterproof Sleeping Bag Cover/Liner
Boost warmth and weather protection without the weight. This Tyvek bivy sack shields your sleeping bag from dew, splash and wind while adding a small warmth bump. Ultralight, packable and tough—ideal for fastpacking, bikepacking and minimalist backpacking.
Key Features
DuPont™ Tyvek® shell: highly water-resistant, windproof and breathable barrier fabric.
Two styles: standard cover or hooded version for extra head protection.
Ultralight & compact: stuffs to a palm-size bundle for easy packing.
Versatile use: bivy outside a quilt/bag, liner inside a shelter, or emergency cover.
Specifications
Material
DuPont™ Tyvek®
Color
White
Size/Weight (no hood)
145 × 80 cm (≈ 57.1 × 31.5 in); ≈ 135 g (≈ 4.8 oz)
Size/Weight (with hood)
230 × 90 cm (≈ 90.6 × 35.4 in); ≈ 200 g (≈ 7.1 oz)
Packed Size
16 × 8.5 cm (≈ 6.3 × 3.35 in)
Features
Water-resistant, windproof, breathable; helps keep bag clean and warmer
What’s Included
1 × Sleeping bag cover/bivy (sleeping bag not included)
Use & Care
Best for splash/condensation and wind protection; not for prolonged submersion.
For maximum weather resistance, align and close openings carefully; seam-sealing is recommended if heavy rain is expected.
Wipe clean or hand wash gently; air dry. Tyvek softens/quietens with use.
Brand names DuPont™ and Tyvek® are property of their respective owners.
