Probably the best bivi bag for climbers wanting a super light and compact design. It is a very lightweight and small-packing bivi-bag made of a lightweight waterproof breathable fabric.
It may not be as breathable as a Gore-tex bag but it's breathable enough, and at around half the weight and half of the price, who's complaining?!
The bag does up by means of a draw-cord enclosure. This can be closed down to a breathing hole ca 2cm in diameter. In heavy rain it is necessary to lie face down to stop water getting in.
The original version was personally tested by Needle Sports' staff in The Himalayas, the Arctic and, worst of the lot, the Cuillins in February. Brilliant!
70d Hyperlite Storm fabric.
Size: 250cm long and at its widest 87cm.
Packed size: 25cm x 11cm.
Weight 440g according to Rab but actually lighter at ca 400g.