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Therm-a-Rest Hyperion 20F/-6C (Regular) vs Western Mountaineering HighLite Sleeping Bag

Weight and specs compared for 2026 — and which one to choose.

Western Mountaineering HighLite Sleeping Bag is the lighter option — 107 g lighter than the Therm-a-Rest Hyperion 20F/-6C (Regular) (19% less weight). If grams matter to you, that is the one to beat.
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Spec Therm-a-Rest Hyperion 20F/-6C (Regular) Western Mountaineering HighLite Sleeping Bag
Weight 567 g · 0.567 kg · 1.25 lb 460 g · 0.460 kg · 1.01 lb
Brand Therm-a-Rest Western Mountaineering
Category Sleep System Sleep System
Therm-a-Rest Hyperion 20F/-6C (Regular)
567 g

Ultralight 20F down mummy bag with 900-fill Nikwax Hydrophobic Down for fast-and-light backpacking.

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Western Mountaineering HighLite Sleeping Bag
460 g

800-fill goose down sleeping bag rated to 35°F/2°C. Exceptionally light at 460g in 5'6" length, ideal for warm-weather thru-hiking.

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Therm-a-Rest Hyperion 20F/-6C (Regular) vs Western Mountaineering HighLite Sleeping Bag: which should you buy?

If saving weight is your priority, the Western Mountaineering HighLite Sleeping Bag wins — at 460 g it is 107 g (19%) lighter than the Therm-a-Rest Hyperion 20F/-6C (Regular) (567 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.

See where both rank against everything else in this category on the lightest sleep system page, or browse the full gear weight database.

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