Forclaz Trek MT900 5°C Down vs Therm-a-Rest Vesper 20F
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 →Ultralight quilt with 900-fill hydrophobic Nikwax Treated Down. Rated 20°F with neck baffle and footbox snap. Among lightest mainstream quilts.
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Forclaz Trek MT900 5°C Down vs Therm-a-Rest Vesper 20F: which should you buy?
If saving weight is your priority, the Therm-a-Rest Vesper 20F wins — at 550 g it is 280 g (34%) 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.