The standard is scoped to adult sporting bags under specified test conditions.
How to use this answer
Special designs, children's bags and very cold expedition models need separate scrutiny. This separates a useful measurement from a broad product label and helps identify which exact variant needs further checking.
Decision boundary
The listed values describe a product under its stated source conditions. They do not establish personal comfort, safety, stock, or fit in every shelter.
Temperature and fit context
ISO 23537-1:2022 describes adult bag testing under controlled conditions. Product labels and untested claims are not interchangeable with comfort or lower-limit numbers. A sleeping pad, clothing, humidity and individual metabolism change real comfort.
For this question, check: ISO comfort and lower limit where available, maximum user height, shoulder room, fill and actual pad insulation. When a particular specification is absent, keep the decision open rather than treating a missing value as zero or assuming a universal fit.
Compare actual recorded values
The values below come from exact catalog variants. The table is an illustration of which measurements to compare, not a ranking or a recommendation. Open each card for the field source and revision notes.
| Exact variant | Product label | Comfort | Listed weight |
|---|---|---|---|
| Western Mountaineering TerraLite — 84 in manufacturer size | 25°F (-3.9°C) | 28°F (-2.2°C) | 2.13 lb (964 g) |
| Western Mountaineering UltraLite — 78 in manufacturer size | 20°F (-6.7°C) | 25°F (-3.9°C) | 1.94 lb (879 g) |
| Western Mountaineering VersaLite — 78 in manufacturer size | 10°F (-12.2°C) | 21°F (-6.1°C) | 2.13 lb (964 g) |
These records illustrate how the reported measurements and source links are presented; they are not personal field tests or ranked recommendations.
Before you rely on a number
Recheck manufacturer instructions and the exact year, size and SKU. The October 30, 2026 dataset does not verify real-time inventory, sale prices, field performance or a guaranteed safe temperature. If the key measurement for this question is unavailable, ask the maker or measure your own equipment before committing to a setup.
Sources and further reading
Source pages and product listings can change. Specifications were assembled from the supplied dataset as of October 30, 2026; current availability is not guaranteed.
See an error? Send a correction