Sea to Summit Ultralight XR Insulated (Short) vs Therm-a-Rest Vesper 20 Sleeping Bag
Weight and specs compared for 2026 — and which one to choose.
Ultralight insulated sleeping pad at 13.8 oz (390g) for 66-inch length with 3.6 R-value, lightest inflatable option available.
Full details →900-fill hydrophobic goose down sleeping bag rated to 20°F/-6°C. Ultralight and highly compressible for three-season backpacking.
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Sea to Summit Ultralight XR Insulated (Short) vs Therm-a-Rest Vesper 20 Sleeping Bag: which should you buy?
If saving weight is your priority, the Sea to Summit Ultralight XR Insulated (Short) wins — at 390 g it is 160 g (29%) lighter than the Therm-a-Rest Vesper 20 Sleeping Bag (550 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.