Sea to Summit Spark SP I vs Zpacks Solo Quilt 20F

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

Zpacks Solo Quilt 20F is the lighter option — 62 g lighter than the Sea to Summit Spark SP I (16% less weight). If grams matter to you, that is the one to beat.

Spec	Sea to Summit Spark SP I	Zpacks Solo Quilt 20F
Weight	397 g · 0.397 kg · 0.88 lb	335 g · 0.335 kg · 0.74 lb
Brand	Sea to Summit	Zpacks
Category	Sleep System	Sleep System

Sea to Summit Spark SP I

397 g

Ultralight 850-fill down sleeping bag rated to 25°C.

Full details →

Zpacks Solo Quilt 20F

335 g

900-fill power down quilt with 20F (-7C) temperature rating in ultralight DCF shell. Pad attachment straps and adjustable snap footbox included.

Check price Full details →

Sea to Summit Spark SP I vs Zpacks Solo Quilt 20F: which should you buy?

If saving weight is your priority, the Zpacks Solo Quilt 20F wins — at 335 g it is 62 g (16%) lighter than the Sea to Summit Spark SP I (397 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.

More sleep system comparisons

Sea to Summit Spark SP I vs NEMO Equipment Tensor Elite Sleeping Pad Sea to Summit Spark SP I vs Therm-a-Rest NeoAir UberLite Sea to Summit Spark SP I vs NEMO Tensor Elite Ultralight Insulated Sea to Summit Spark SP I vs Nemo Tensor Ultralight Sea to Summit Spark SP I vs Zpacks Classic Sleeping Bag 20F Sea to Summit Spark SP I vs Therm-a-Rest NeoAir XLite NXT