A game changer for modern alpine climbing or fast and light hiking, running or adventure travel. No need to contemplate cutting weight by sharing a sleeping bag with your climbing partner who hasn't showered in a week, the Sea to Summit Spark series of bags are contenders for the best warmth to weight ratio of bags on the planet and specifically target those people who need to shed every gram and would possibly consider not taking a bag at all.
The Spark SpIV uses the highest possible quality of responsibly-sourced down, 850+ loft, Ultra-Dry water repellent European goose down, and an ultra-thin 10D nylon shell. It's no slouch in the design department either: the contoured mummy shape, full hood and draft tubes (zip, neck & hood) conserve heat efficiently, and vertical chest baffles prevent migration when horizontal. At 880g this has to be the lightest -15°C (lower limit) bag in the world. All this and it fits in a 3.3 litre bag! Comes with compression sack and storage cell.
Sea to Summit's Spark series of sleeping bags are designed to be the pinnacle of lightweight warmth for any conditions - an ultralight down bag for travellers, adventure racers and minimalists of all persuasions.
Sea To Summit Spark SPIV Sleeping Bag Features
Contoured mummy shape
1/3 length side zip which saves weight and boosts warmth (this does mean however that it cannot be opened up like a blanket)
7D and 10D Pertex Quantum shell
850+ European Goose down with DWR (Durable Water Repellent) Treatment
