← All gear comparisons

Sea to Summit Spark 30 Sleeping Bag vs Zpacks Classic Sleeping Bag 20F

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

No winner on weight yet. The recorded weights have not both been verified on the same basis. Size, included parts and single-item versus pair weights can differ. Check the linked sources before choosing a replacement.

Swipe to see all details.

Spec Sea to Summit Spark 30 Sleeping Bag Zpacks Classic Sleeping Bag 20F
Weight 482 g · 0.482 kg · 1.06 lb
size Regular, 30°F / -1°C
 533 g · 0.533 kg · 1.18 lb
size Standard-Medium (fits up to 6'0"), 20°F; no size called Regular exists
Brand Sea to Summit Zpacks
Category Sleep System Sleep System
Sea to Summit Spark 30 Sleeping Bag
482 g

Ultralight 30°F mummy bag filled with 850+ loft down. Differential cut and ripstop shell deliver excellent warmth-to-weight ratio.

See it in your base weight → Full details →
Zpacks Classic Sleeping Bag 20F
533 g

Mummy-style sleeping bag rated to 20F (-7C) with 900-fill goose down. DCF outer shell for low weight and packability. Water-resistant treatment included.

See it in your base weight → Full details →

Building a pack? Add either one to your HikeLoad list, or drop its weight into the base weight calculator, and see what it does to your total weight.

HikeLoad is reader-supported. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Learn more.

Sea to Summit Spark 30 Sleeping Bag vs Zpacks Classic Sleeping Bag 20F: which should you buy?

The listed weights alone are not enough to choose between these products. Confirm the size, included parts and weight basis against each source; choose equipment for the function and fit you need.

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 30 Sleeping Bag vs Sea to Summit Spark SP I Sea to Summit Spark 30 Sleeping Bag vs Western Mountaineering HighLite 35F Sea to Summit Spark 30 Sleeping Bag vs Western Mountaineering AstraLite Sea to Summit Spark 30 Sleeping Bag vs Sea to Summit Ember XT 0°C Sleeping Bag Sea to Summit Spark 30 Sleeping Bag vs Sea to Summit Ember Sleeping Bag Sea to Summit Spark 30 Sleeping Bag vs Sea to Summit Spark Pro Down 30