Updated With New Color & Styling Still designed to fit our revolutionary Backcountry Bed and a 2.5" inflatable pad on the inside of the bivy, so you can sleep as comfortably on a rock ledge, as you do at home. Key Features Large u-shaped opening Mesh window panel Waterproof/breathable top fabric Fully taped seams (pvc free) Compatible with most sleeping bags, especially the Backcountry Bed Materials Top Fabric:20D Nylon Ripstop WPB, DWR/10,400MM PeU, 18,300 g/day MVTR Bottom Fabric:30D Nylon Ripstop, DWR/1200mm PeU, FR CPAI84 Tech Specs REGULAR Minimum Weight: 13oz / 0.37kg Packaged Weight: 14 oz / 0.40kg Length: 80" / 203cm Shoulder Width: 36" / 91cm Storage Bag Size (L x W): 10" x 4"/ 25.4cm x 10.2 cm LONG Minimum Weight: 15oz / 0.42kg Packaged Weight: 16 oz / 0.45kg Length: 86" / 218cm Shoulder Width: 40" / 102cm Storage Bag Size (L x W): 10" x 4"/ 25.4cm x 10.2 cm | Sierra Designs Backcountry Bivy Backpack, Size Regular