€139.00
Ships the same day if ordered before 1:00 p.m. with express delivery
Availability: In stock & Available in our store
The opinion of Aventure Nordique
Cumulus Ultralight Bivi to protect your sleeping bag against moisture and wind. Fabric in Pertex Endrance DWR is totaly waterproof and breathable. The seams are placed hight away from the ground to minimize contact with snow and water. This product is equiped with anatomical hood. Two stoppers for easy regulation to the hood. It is ideal for protection against moisture in a tent, tarp or igloo. It is not enough to sleep under the stars in the rain. Compatible with all cumulus sleeping bags. Comes with a stuff sack.
Technical details
| Brand | Cumulus |
|---|---|
| Product name | Ultralight Bivi |
| Season | 4 season |
| Model | Unisex |
| Dimensions | Length: 210 cm - Maximum user height: 205 cm - Width (top/bottom): 87/64 cm |
| Outer shell | Pertex Endurance DWR, 36 g/m² - 1000 mm |
| Weight | 140 g |
| Zipper | No zipper |
| Additional information | Stuffsack’s dimensions (height/diameter): 12/7 cm |
| Warranty | Lifetime |
| Country of Manufacture | Poland |
1 verified customer reviews 
Posted on 26/10/2025
Truly lightweight. It weighs halfthe weight of many covers in the same category (windproof-water resistant), from BD, ME, Rab, MSR,(siliconized finish, Drylite, and various inductions or membranes). etc., with the same good or bad performance. The condensation problems are the same as any other. Directly proportional to the relative humidity, period. Two typical examples: On a windy, cold night with low to medium humidity, the result is very satisfactory. On a calm night with medium to high humidity, you'll wake up with the outside of the cover, and the outside of the sleeping bag, wet. In any case, it's the best cover I've ever had, as it's very well made, performs as well as any other, and weighs half as much. Very happy.