Circuit Down Sleeping Bag

Adapt to any adventure. The Circuit’s semi-tapered-rectangular shape fits you and fits your travelling, camping and backpacking lifestyle. Its extra width allows you to sleep on your side, wrapped in 650+fillpower down and soft-touch fabrics. As the weather warms, the wraparound zipper lets you ventilate the bag from top to bottom, and even open it as a fully flat quilt. Sea to Summit design and quality, non-PFAS recycled materials and ISO-tested performance make this light, packable bag the perfect travel companion.

Tech Specs

Best Use

Backpacking, Camping, Travel

Materials

Shell: 100% Recycled Polyester
Lining: 100% Recycled Polyester
Insulation: FP650 Grey Duck Down 80/20 DWR RDS
Compression Sack: 100% Recycled Nylon
Storage Cell: 100% Recycled Nylon

Zipper Configuration

Left Handed Full-Length YKK#5 with Zipper Plow

Insulation

FP650GDD

Specifications by Temp Rating & Size

Temp Rating & Size	Weight	Packed Weight	Dimension	Packed Size	Compressed Volume	Length	Recommended User Height	Fill Weight	Temp Rating (ISO Lower)	Temp Rating (ISO Comfort)
30°F / Short	770 g \| 27.2 oz	900 g \| 31.7 oz	192 x 72.5 cm \| 75.6 x 28.5 in	41 x 22.5 x 15.5 cm \| 16.1 x 8.9 x 6.1 in	5.1 L	192cm \| 75.6in	170 cm \| 5 ft 7 in in	384 g \| 13.5 oz	-1 °C \| 30 °F	2 °C \| 36 °F
30°F / Regular	820 g \| 28.9 oz	950 g \| 33.5 oz	207 x 72.5 cm \| 81.5 x 28.5 in	41 x 22.5 x 15.5 cm \| 16.1 x 8.9 x 6.1 in	5.4 L	207cm \| 81.5in	185 cm \| 6 ft 1 in in	411 g \| 14.5 oz	-1 °C \| 30 °F	2 °C \| 36 °F
30°F / Regular Wide	890 g \| 31.4 oz	1030 g \| 36.3 oz	207 x 82.5 cm \| 81.5 x 32.5 in	41 x 22.5 x 15.5 cm \| 16.1 x 8.9 x 6.1 in	5.9 L	207cm \| 81.5in	185 cm \| 6 ft 1 in in	460 g \| 16.2 oz	-1 °C \| 30 °F	2 °C \| 36 °F
30°F / Long	910 g \| 32.1 oz	1040 g \| 36.7 oz	222 x 77.5 cm \| 87.4 x 30.5 in	41 x 22.5 x 15.5 cm \| 16.1 x 8.9 x 6.1 in	6 L	222cm \| 87.4in	198 cm \| 6 ft 6 in in	469 g \| 16.5 oz	-1 °C \| 30 °F	2 °C \| 36 °F
15°F / Short	1080 g \| 38.1 oz	1250 g \| 44.1 oz	192 x 72.5 cm \| 75.6 x 28.5 in	46 x 27.5 x 18 cm \| 18.1 x 10.8 x 7.1 in	9 L	192cm \| 75.6in	170 cm \| 5 ft 7 in in	664 g \| 23.4 oz	-9 °C \| 16 °F	-5 °C \| 23 °F
15°F / Regular	1160 g \| 40.9 oz	1330 g \| 46.9 oz	207 x 72.5 cm \| 81.5 x 28.5 in	46 x 27.5 x 18 cm \| 18.1 x 10.8 x 7.1 in	9.7 L	207cm \| 81.5in	185 cm \| 6 ft 1 in in	715 g \| 25.2 oz	-9 °C \| 16 °F	-5 °C \| 23 °F
15°F / Regular Wide	1260 g \| 44.4 oz	1430 g \| 50.4 oz	207 x 82.5 cm \| 81.5 x 32.5 in	46 x 27.5 x 18 cm \| 18.1 x 10.8 x 7.1 in	10.5 L	207cm \| 81.5in	185 cm \| 6 ft 1 in in	798 g \| 28.1 oz	-9 °C \| 16 °F	-5 °C \| 23 °F
15°F / Long	1290 g \| 45.5 oz	1450 g \| 51.1 oz	222 x 77.5 cm \| 87.4 x 30.5 in	46 x 27.5 x 18 cm \| 18.1 x 10.8 x 7.1 in	10.8 L	222cm \| 87.4in	198 cm \| 6 ft 6 in in	814 g \| 28.7 oz	-9 °C \| 16 °F	-5 °C \| 23 °F

Key Features

Comfort in all conditions - Opens flat for airflow on warm nights or zips closed to lock in warmth when temperatures drop
Efficient packability - Quality 650+ fillpower Ultra‑Dry Duck Down and lightweight fabrics allow the Circuit to pack down small into the supplied compression sack
Room to move - Comfort-oriented, brushed liner maximise movement and maintain warmth all night
Precise ventilation - Wrap‑around zip lets you fully open the footbox for maximum venting and fine-tune airflow to regulate temperature
Lightweight breathability - Featherlight 20D polyester balances airflow for moisture management with proven durability for long-term use
Consistent insulation - Hybrid box‑baffle construction prevents down migration, eliminating cold spots for even warmth
Easy zipping - YKK #5 coil zipper with anti‑snag plough ensures smooth, jam‑free operation in all conditions for hassle‑free use
Draft protection - Shaped collar and continuous down-filled draft tubes minimise heat loss and maximise retained warmth
Verified warmth - ISO 23537 certification confirms dependable insulation performance for rated temperatures
Internal pocket - Zippered pocket stores essentials like your phone or head torch securely while keeping them insulated from the cold
Lower impact materials - Constructed from bluesign APPROVED, 100% recycled fabrics are designed to go the distance

Temp Rating & Size	Weight	Packed Weight	Dimension	Packed Size	Compressed Volume	Length	Recommended User Height	Fill Weight	Temp Rating (ISO Lower)	Temp Rating (ISO Comfort)
30°F / Short	770 g \| 27.2 oz	900 g \| 31.7 oz	192 x 72.5 cm \| 75.6 x 28.5 in	41 x 22.5 x 15.5 cm \| 16.1 x 8.9 x 6.1 in	5.1 L	192cm \| 75.6in	170 cm \| 5 ft 7 in in	384 g \| 13.5 oz	-1 °C \| 30 °F	2 °C \| 36 °F
30°F / Regular	820 g \| 28.9 oz	950 g \| 33.5 oz	207 x 72.5 cm \| 81.5 x 28.5 in	41 x 22.5 x 15.5 cm \| 16.1 x 8.9 x 6.1 in	5.4 L	207cm \| 81.5in	185 cm \| 6 ft 1 in in	411 g \| 14.5 oz	-1 °C \| 30 °F	2 °C \| 36 °F
30°F / Regular Wide	890 g \| 31.4 oz	1030 g \| 36.3 oz	207 x 82.5 cm \| 81.5 x 32.5 in	41 x 22.5 x 15.5 cm \| 16.1 x 8.9 x 6.1 in	5.9 L	207cm \| 81.5in	185 cm \| 6 ft 1 in in	460 g \| 16.2 oz	-1 °C \| 30 °F	2 °C \| 36 °F
30°F / Long	910 g \| 32.1 oz	1040 g \| 36.7 oz	222 x 77.5 cm \| 87.4 x 30.5 in	41 x 22.5 x 15.5 cm \| 16.1 x 8.9 x 6.1 in	6 L	222cm \| 87.4in	198 cm \| 6 ft 6 in in	469 g \| 16.5 oz	-1 °C \| 30 °F	2 °C \| 36 °F
15°F / Short	1080 g \| 38.1 oz	1250 g \| 44.1 oz	192 x 72.5 cm \| 75.6 x 28.5 in	46 x 27.5 x 18 cm \| 18.1 x 10.8 x 7.1 in	9 L	192cm \| 75.6in	170 cm \| 5 ft 7 in in	664 g \| 23.4 oz	-9 °C \| 16 °F	-5 °C \| 23 °F
15°F / Regular	1160 g \| 40.9 oz	1330 g \| 46.9 oz	207 x 72.5 cm \| 81.5 x 28.5 in	46 x 27.5 x 18 cm \| 18.1 x 10.8 x 7.1 in	9.7 L	207cm \| 81.5in	185 cm \| 6 ft 1 in in	715 g \| 25.2 oz	-9 °C \| 16 °F	-5 °C \| 23 °F
15°F / Regular Wide	1260 g \| 44.4 oz	1430 g \| 50.4 oz	207 x 82.5 cm \| 81.5 x 32.5 in	46 x 27.5 x 18 cm \| 18.1 x 10.8 x 7.1 in	10.5 L	207cm \| 81.5in	185 cm \| 6 ft 1 in in	798 g \| 28.1 oz	-9 °C \| 16 °F	-5 °C \| 23 °F
15°F / Long	1290 g \| 45.5 oz	1450 g \| 51.1 oz	222 x 77.5 cm \| 87.4 x 30.5 in	46 x 27.5 x 18 cm \| 18.1 x 10.8 x 7.1 in	10.8 L	222cm \| 87.4in	198 cm \| 6 ft 6 in in	814 g \| 28.7 oz	-9 °C \| 16 °F	-5 °C \| 23 °F