← Gear database

Marmot Hydrogen 30°F vs Therm-a-Rest Hyperion 20

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

Therm-a-Rest Hyperion 20 is the lighter option — 142 g lighter than the Marmot Hydrogen 30°F (20% less weight). If grams matter to you, that is the one to beat.
shopping_cart Check today's price on Amazon
Spec Marmot Hydrogen 30°F Therm-a-Rest Hyperion 20
Weight 709 g · 0.709 kg · 1.56 lb 567 g · 0.567 kg · 1.25 lb
Brand Marmot Therm-a-Rest
Category Sleep System Sleep System
Marmot Hydrogen 30°F
709 g

Ultralight 800-fill down sleeping bag rated to 30°F.

Full details →
Therm-a-Rest Hyperion 20
567 g

900-fill Hyperdry down mummy sleeping bag rated to 20F/-6C. 10D ripstop nylon shell with DWR treatment. Regular size.

Full details →

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

Marmot Hydrogen 30°F vs Therm-a-Rest Hyperion 20: which should you buy?

If saving weight is your priority, the Therm-a-Rest Hyperion 20 wins — at 567 g it is 142 g (20%) lighter than the Marmot Hydrogen 30°F (709 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

Marmot Hydrogen 30°F vs Sea to Summit Aeros Ultralight Pillow Marmot Hydrogen 30°F vs Sea to Summit Aeros Ultralight Pillow (Regular) Marmot Hydrogen 30°F vs NEMO Fillo Elite Marmot Hydrogen 30°F vs Nemo Fillo Elite Wide UL Marmot Hydrogen 30°F vs Nemo Equipment Tensor Elite Ultralight Marmot Hydrogen 30°F vs NEMO Equipment Tensor Elite Sleeping Pad