Fly Creek UL 25°

Fly Creek UL 25 Sleeping Bag

Premium, packable, minimalist mummy sleeping bag

Redefine backcountry comfort with the Fly Creek UL 25—the ideal ultralight bag for minimalist adventures.

Built with premium materials like ultralight NetPlus® fabric (made from recycled fishing nets) and high-quality 850-fill Downtek™, this bag delivers serious warmth without the bulk. Big Agnes’ Signature Diamond Quilting enhances packability while maintaining efficient insulation.

From the ergonomic footbox to the insulated draft collar, every detail is designed to maximize thermal efficiency while keeping weight to a minimum. The result is a technical sleeping bag that’s perfect for fastpacking, thru-hiking, and three-season overnight trips.

Specs

• Total Weight: 1 lb 10 oz
• ISO Comfort: 35°F
• ISO Limit: 25°F
• Fill Type: 850-fill Downtek™ (PFC-Free)
• Fill Weight: 17 oz
• Compressed Size: 8" x 9.5"
• Stuff Sack Size: 7.5" x 15"
• Max User Height: 6'
• Shoulder Girth: 60"
• Hip Girth: 54"
• Foot Girth: 36"

Materials

• Shell / Lining: Ultralight recycled NetPlus® 10D nylon ripstop
  • Made from recycled fishing nets
  • Water-repellent finish (no intentionally added PFAS)
• Insulation:
  • 850-fill Downtek™ PFC-Free
  • Maintains insulation even when wet
  • Uses bluesign® approved water-repellent chemistry (no intentionally added PFAS)

Construction & Features

• Big Agnes Signature Diamond quilt-through construction (top)
• Baffled construction (bottom and sides)
• Ergonomic footbox for better warmth and comfort
• Insulated draft collar to reduce heat loss
• Anti-snag #3 zipper for smooth operation
• Includes storage sack and stuff sack