Western Mountaineering TransAlp Down Sleeping Bag

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Light, packable and built for fast-moving summer nights, the TransAlp offers reliable comfort with minimal fuss.

Mountain Equipment says: 

A lightweight and environmentally conscious bag to help free up space on your travels. Perfect for overnights in huts or for trips further away from home.

Our Verdict

At 444g (Regular), the TransAlp Down Sleeping Bag blends lightweight design with reassuring warmth for milder conditions. It’s 600-fill duck down and a narrow baffle layout that traps heat evenly without bulk, while the breathable, recycled shell fabric resists dampness. Mountain Equipment’s mountain fit is snug but not restrictive, with a shaped hood and footbox that work well for a natural sleeping posture.

The head-to-toe side zip is a useful touch, offering decent venting for warmer nights. Temperature-wise, it’s best suited to around 8°C. The down lofts well after compression, and the construction quality is consistent throughout—this doesn’t feel like a compromise bag.

– Reviewed by Ultralight Outdoor Gear

Features

•  Mountain fit maximises thermal efficiency
• Stitch-Through narrow baffle top
• Stitch-Through quilted base
• Mid-level side seams
• Generous shaped hood
• 4 baffle anatomically shaped and offset foot-box
• Head-to-toe 165cm side zip for improved comfort and ventilation

Specifications

• Regular weighs: 444g
• Long weighs: 476g
• Fill Weight: 130g
• Std Pack Size: 24cm x 10cm x 8cm

Temperature Ratings

*Mountain Equipment use their own ‘Good Nights Sleep Guaranteed’ rating which they believe is a more accurate number for some sleeping bags and is based not just on the EN test results but on lab testing, their own use, thermal imaging and cold chamber work, along with a lot of data analysis.

• Good Nights Sleep Guaranteed: 8°C /46°F
• Comfor: 14°C/57°F
• Comfort Limit: 10°C/50°F
• Extreme:-1°C/-30°F

Material & Construction

• 100% recycled Earthrise shell and lining fabrics are lightweight and downproof
• 130g of 80-20 Pure Duck Down with a minimum fill power of 600

Help & advice:

• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• The EN13537 Standard
• Mountain Equipment Sleeping Bag Guide
• All About Down
• Why is ‘PFC Free’ Important?
• Recycled Content in Outdoor Gear