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 Available Options Temp Rating 30°F 15°F Size Short Regular Regular Wide Long