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Therm-a-Rest Vesper 20 Quilt — Specs & Analysis
Manufacturer specifications, compared against every other sleep systems in our database. We do not test gear in the field — we measure, verify, and compare.
The Vesper 20 is Therm-a-Rest's down quilt designed to pair seamlessly with their sleeping pads via the SynergyLink connector system. The 900fp Nikwax Hydrophobic down resists moisture, and the blanket-style design offers freedom of movement that mummy bags can't match.
Who Is the Therm-a-Rest Vesper 20 Quilt Best For?
Bikepackers already in the Therm-a-Rest ecosystem who want a matching quilt system. If that describes your riding style, the Vesper 20 Quilt should be at the top of your shortlist. It sits in the Sleep Systems category alongside 19 other products we track.
How It Compares
At 570g and $280, the Vesper 20 Quilt is 320g heavier than the lightest option in this category (the Therm-a-Rest NeoAir UberLite at 250g). The most budget-friendly option is the Cascade Designs Therm-a-Rest Z Lite Sol at $50.
The price-to-weight ratio comes in at $49 per 100g — a premium price point, but you're paying for quality, materials, and design that justify the investment for serious bikepackers.
What We Like
- +SynergyLink system locks quilt to pad — no drafts
- +900fp Nikwax Hydrophobic down for wet conditions
- +Generous cut works well for side and stomach sleepers
- +Packs down small for a 20-degree quilt
Watch Out For
- −SynergyLink works best with Therm-a-Rest pads
- −Heavier than cottage-brand quilts at this temp rating
- −Stuff sack is tight — use a compression sack for easier packing
The Bottom Line
We haven't scored the Therm-a-Rest Vesper 20 Quilt, and neither has anyone else we can cite. It's here for its verified specifications and dimensions, which is what the fit tools run on — a score is an editorial judgement, and we don't hand one out until someone has a basis for it. What this page can tell you is measured: 570g, $280, and how both sit against every other sleep systems product we track.
The price and weight above have not yet been checked against the manufacturer's own page. We are working through the catalogue and saying so as we go, rather than letting silence imply otherwise.
Specifications and dimensions come from the sources listed above. Where a page draws on first-hand riding, it says so.
What it packs down to
Therm-a-Rest publishes a packed size of 7 x 9 in, which is 5.7 litres as a stuff sack. Of the 55 bags we track that publish a capacity, 29 have room for it and 26 do not.
Volume is computed from Therm-a-Rest's own packed size, treating a two-dimension figure as a stuff sack. Bag capacities are the makers' published figures, not ours — 12 of the bags we hold dimensions for publish no capacity and are left out of the count rather than assumed. A stuff sack does not reshape itself, so read the headroom as room to spare rather than a guarantee it goes in easily.
How it compares
Against the 20 sleep systems we hold published specs for.
At 570g the Vesper 20 Quilt is lighter than 4 of 19 alternatives we track. The category median is 465g.
At $280 it undercuts 7 of 19 of them, against a median of $235. That works out at $49 per 100g — below the $51 median for sleep systems.
Weight and price come from published specifications. Cost per 100g is a blunt measure — it rewards light gear and says nothing about durability or whether the thing works — so treat it as one input, not a verdict.
More in Sleep Systems
Sleeping bags, quilts, and pads that pack small and keep you warm on the trail.