Therm-a-Rest Hyperion 20 vs Zpacks Classic Sleeping Bag 20F
Weight and specs compared for 2026 — and which one to choose.
900-fill Hyperdry down mummy sleeping bag rated to 20F/-6C. 10D ripstop nylon shell with DWR treatment. Regular size.
Check price Full details →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.
Check price Full details →Therm-a-Rest Hyperion 20 vs Zpacks Classic Sleeping Bag 20F: which should you buy?
If saving weight is your priority, the Zpacks Classic Sleeping Bag 20F wins — at 347 g it is 220 g (39%) lighter than the Therm-a-Rest Hyperion 20 (567 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.