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Rab Mythic Ultra 180 (32°F) vs Zpacks Summer Quilt

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

Zpacks Summer Quilt is the lighter option — 156 g lighter than the Rab Mythic Ultra 180 (32°F) (39% less weight). If grams matter to you, that is the one to beat.
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Spec Rab Mythic Ultra 180 (32°F) Zpacks Summer Quilt
Weight 400 g · 0.400 kg · 0.88 lb 244 g · 0.244 kg · 0.54 lb
Brand Rab Zpacks
Category Sleep System Sleep System
Rab Mythic Ultra 180 (32°F)
400 g

Ultra-lightweight 3-season sleeping bag weighing just 14.1 oz (400g) with 900-fill hydrophobic goose down and titanium technology.

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Zpacks Summer Quilt
244 g

Minimal 8.6-ounce quilt for warm weather camping. Doubles as winter sleeping bag liner.

Full details →

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Rab Mythic Ultra 180 (32°F) vs Zpacks Summer Quilt: which should you buy?

If saving weight is your priority, the Zpacks Summer Quilt wins — at 244 g it is 156 g (39%) lighter than the Rab Mythic Ultra 180 (32°F) (400 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.

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