Be Ready: the sleeping bags worth keeping for a power cut
Two-person1 / 2

Images: Ortovox and its retailers. Used for product identification.

Ortovox

Ortovox Bivy Ultralight

A 150 g emergency bivy for one or two people that packs to 5 × 5 × 9 cm.

Weight
150 g
Thermal
Reflective
Packed
5 × 5 × 9 cm

Best price found

£21.28

at Alpinetrek · In stock · RRP £25.95

View Deal
  • HardloopIn stock · Shocking Orange£22.90View Deal
  • Absolute SnowOut of stock at check · Currently unavailable£25.95View Deal

Prices checked 31 October 2026. We may earn a commission on these links.

  • Waterproof
  • Windproof
  • Heat reflective
  • 1–2 person
  • Stuff sack

Specifications

Weight
150 g (Includes stowaway bag)
Packed size
5 × 5 × 9 cm
Material
Polyethylene with PU coating outside and aluminium-coated inside
Thermal claim
Aluminium inner coating reflects body heat (no % published by Ortovox)
Open size
110 × 235 cm (retailer figure), fits 1–2 people
Manufacturer page →

Pros & cons

  • 150 g and 5 × 5 × 9 cm packed, small enough for a hip belt or first-aid kit (Ortovox)
  • Wide enough to share: Ortovox rates it for 1 or 2 people
  • Aluminium-coated inside reflects body heat; PU-coated outside is windproof and waterproof
  • Non-breathable film, so expect heavy condensation inside (Wilderness Times)
  • No hood or closure: it's an open sack, not a shelter for a planned night out

Sources for this product

  1. 1Ortovox Bivy Ultralight product page
  2. 2Wilderness Times review
  3. 3Alpinetrek listing
  4. 4Hardloop listing
  5. 5Absolute Snow listing (dimensions)

More emergency bivvies

Full comparison →