Sea to Summit designed its Trek TKI 30 Degree down bag for backpackers and campers looking for a wider-cut mummy that is still lightweight and doesnt sacrifice insulation or features to shave ounces. An oversized draft tube and vertical baffles ensure cold stays out and heat stays

• Dual Zip Ventilation The full-length side zipper and footbox zipper allow you to turn the bag into a down comforter on warmer nights or when hanging out by the campfire. You can also just unzip the footbox zipper to cool off or to pop your feet out and move around.
• Relaxed Fit Extra room at the hips and knees allows for more sleeping positions and reduces cold spots.
• Internal Pocket Keep essentials like your phone, headlamp, contacts, and more close-by and warm while you sleep.
• Tapered rectangular for more space and comfort than a traditional mummy bag
  
• RDS 650+ Loft ULTRA-DRY Down offers excellent insulation and compressibility
• Lightweight fabrics for reduced weight and bulk
  
• Vertical chest baffles prevent down migration and cold spots
  
• Two-way 5 YKK side and separate foot zip allows bag to double as a quilt and provides extra ventilation options
• Oversized zip draft tube with anti-snag materials
• Large internal security pocket
• 3D side-wall baffle maximizes down insulation right to the edge of the bag
• 3D hood draws in tight when needed
• Soft-touch 20D lining fabric is lightweight and highly breathable, durable 30D Nylon shell
• Includes Ultra-Sil Compression Bag for compact storage
• Zip Coupling: This bag is designed to pair with many Sea to Summit Women s sleeping bags
• Gender: Unisex
• Insulation Type: Down
• Down RDS 90/10 Premium Down
  
• Fabric: 30D Nylon shell
• Fill Power: ULTRA-DRY Down 650+ Loft
  
• Fill Weight: Regular: 350g
• Shape: Tapered Rectangle
• Temp Rating: EN 5 c Comfort to -1 c Lower
• Weight: Regular: 760g