Ultralight & High-Performance: The Spark Mummy Sleeping Bag Series
Designed for backcountry adventurers who demand both warmth and weight savings, the Spark Ultralight Mummy Sleeping Bag series delivers top-tier performance without unnecessary bulk. Whether you need a down-filled liner for mild nights or a winter-ready bag for sub-freezing temps, this lineup combines premium materials with smart design to keep you comfortable on the trail.
Why Backpackers Love the Spark Series:
Ultra-Dry 850+ Loft Down: 90% goose down cluster (RDS-certified) ensures superior warmth-to-weight ratio while resisting moisture.
Featherlight Yet Roomy: Snug mummy cut balances warmth with enough wiggle room—no claustrophobic squeeze.
10D Shell & 7D Liner: Ultra-thin yet durable fabrics minimize weight while maximizing packability (compresses to just 1.5L).
Smart Zipper Design: Half-length zippers on warmer models (50°F–28°F) save grams; full-length zippers on cold-weather bags (18°F–5°F) allow coupling with compatible Flame-series bags.
Baffle Engineering: Sewn-through construction for warmer temps; torso baffles or full baffling for sub-freezing conditions.
Perfect For:
Ultralight backpackers prioritizing gear efficiency
Fast-and-light alpine missions or thru-hikes
Anyone tired of bulky sleeping bags robbing pack space
Includes an Ultra-Sil compression sack and storage cell to prolong loft life. Pro tip: Pair with a liner for added versatility—check our care guide to keep your down performing season after season.
Specs:
Temperature Ratings: 50°F to 5°F (+10°C to -15°C)
Weight: From just 12oz (340g)
Best Use: Backpacking, mountaineering, minimalist travel
Sleep lighter, go farther—without sacrificing warmth.
