Forclaz Trek MT900 5°C Down vs Therm-a-Rest Hyperion 20
Weight and specs compared for 2026 — and which one to choose.
700 fill power RDS down mummy-style sleeping bag with 90% duck down. Ideal for 3-season trekking with anatomical hood and adjustable footbox. 5°C comfort rating...
Full details →900-fill Hyperdry down mummy sleeping bag rated to 20F/-6C. 10D ripstop nylon shell with DWR treatment. Regular size.
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Forclaz Trek MT900 5°C Down vs Therm-a-Rest Hyperion 20: which should you buy?
If saving weight is your priority, the Therm-a-Rest Hyperion 20 wins — at 567 g it is 263 g (32%) lighter than the Forclaz Trek MT900 5°C Down (830 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.