SEA TO SUMMIT Circuit Down Sleeping Bag -1C|30F Regular Sleeping bag

The Circuit sleeping bag from Sea to Summit is designed for travellers, backpackers and fans of classic camping who need a reliable companion in a wide range of conditions. The semi-rectangular cut provides plenty of room for side sleeping while still keeping compact dimensions suitable for carrying in a rucksack.

Thanks to the down insulation with 650+ fill power and certification to ISO 23537, you can be confident the bag’s temperature performance matches the stated values. The materials are made from recycled fabrics with bluesign approval, so the Circuit uses natural resources responsibly without compromising durability.

1. Versatile ventilation for any weather
   The wrap-around zip allows the footbox or the entire bag to be fully opened, so on warm nights it can be used as a flat quilt, while when temperatures drop you simply close the bag and the shaped collar together with continuous down tubes prevents heat from escaping.
2. Even warmth without cold spots
   The hybrid box-baffle construction prevents the down from shifting inside the bag, ensuring even insulation across the whole surface and eliminating unwanted cold zones that could disrupt sleep quality even at low temperatures.

• 650+ fill power down insulation, duck down 80/20
• ISO 23537 certification for verified thermal performance
• Wrap-around zip – opens out as a flat quilt
• Hybrid box baffles prevent down migration
• Soft brushed inner fabric for comfort
• YKK #5 zip with anti-snag feature
• Internal zipped pocket for small items
• 100% recycled materials (polyester, nylon)
• Materials approved to the bluesign standard
• No PFAS treatment (non-PFAS DWR)
• Compression sack and storage sack included
• Shaped collar and down tubes to prevent heat loss

Specifications:

Version: 30°F / Regular
Weight: 820 g
Weight with bag: 950 g
Volume (compressed): 5.4 l
Compressed sack dimensions: 41 × 22.5 × 15.5 cm
Bag length: 207 cm
Recommended user height: up to 185 cm
Fill weight: 411 g
ISO temperature limit (Lower): −1 °C / 30 °F
ISO temperature rating (Comfort): 2 °C / 36 °F
Shell: 100% recycled polyester (20D)
Lining: 100% recycled polyester
Insulation: FP650 grey duck down 80/20, DWR, RDS
Zip: YKK #5, left-hand, full length

Temperatures: