Weight: 815g

Limit temperature: -4°C

Best for: Thermal efficiency for shoulder-season tramping and climbing 

Overview

The Ultra -5°C is a light and compact three-quarter-zip bag with 450g of 850 fill-power down encased in a 10D Pertex Quantum DWR-treated shell with 15D lining. This close-fitting bag is optimised for thermal efficiency with a 3D footbox and a highly contoured hood and neck baffle to seal in warmth. In warm conditions, the I-Beam baffle design allows you to shift the down for temperature adjustment. It’s available in five sizes and different temperature ratings. We checked out the Ultra -5 (-4°/2°, limit/comfort). 

Performance

This close-fitting bag felt a bit like the ‘skinny jeans’ of sleeping bags, with its thermally optimised weight-saving fit. Although it’s rated to -4°C (limit), the anatomic 3D hood, lofty baffles and thick elliptical draught collar trap warmth and make this a suitable bag for pushing to the edge of its rating. The 11-baffle footbox is super cosy. Overall this is a high-performance lightweight bag, but it does lose a point for the lack of hydrophobic down or a more water-resistant shell.

What we like

Very cosy for its rating, thermally efficient fit and features, adjustable baffles.

Limitations

Non-hydrophobic down, moderate water-resistance, limited wriggle room.

Why buy the Ultra -5°C? 

This lightweight bag is a great option for trampers and climbers who need high-end features to keep out the cold. The close mummy-fit makes the most of this bag’s 850 fill-power down for plush comfort, but it lacks water resistance for damp conditions.