Innovative Versatility - Choose from a traditional mummy bag design or the FlipIt Footbox quilt that transforms from an open quilt to a fully enclosed sleeping bag Ultralight Premium Materials - Ultralight NetPlus nylon ripstop made from recycled fishing nets paired with high-quality 850-fill down for exceptional warmth-to-weight ratio Big Agnes Signature Diamond Quilting - Prevents down migration while using less stitching than traditional quilt lines, saving weight and providing better loft Thermal Efficiency Design - Insulated draft collars, ergonomic footbox construction, and low-profile cordlocks made with renewable materials ensure maximum warmth retention Packability and Storage - Both models include mesh storage sacks for long-term care and compact stuff sacks for trail use, compatible with Big Agnes Compression Stuff Sacks for minimum packed size The Big Agnes Fly Creek UL Collection delivers ultralight backcountry comfort with innovative sleep systems crafted from sustainable NetPlus ripstop and premium 850-fill down. Choose between the efficient mummy-style sleeping bag with minimalist features or the versatile Zip Quilt with its transformative FlipIt Footbox. Both utilize Signature Diamond Quilting to prevent down migration while maintaining exceptional warmth-to-weight ratio, making them perfect companions for fastpacking, thru-hiking, and minimalist three-season adventures.