Description Securely carry a bike, ski, or climbing helmet on the outside of any Peak Design Outdoor, Travel, or Everyday Backpack with this ultralight, ultra-durable, easily-stowable harness. Attaches to Peak Design Backpacks using our unique Cord Hook(TM) system-simply stretch the carrier around your helmet, clip the 4 hooks to the loops on your PD backpack, and pull the cords tight. Constructed from recycled nylon stretch mesh and elastic cording, both of which are interwoven with Ultra High Molecular Weight Polyethylene (UHMWPE) thread making the Helmet Carrier incredibly light, strong, and abrasion-resistant. Features a reflective safety graphic and bike light clip point. When not in use, the Helmet Carrier easily stuffs into any pocket or corner of your bag. Designed for bike, ski/snowboard, and climbing helmets. Not compatible with most full-cage/motorcycle helmets. Dimensions*Stretch Panel Dimensions: 21 cm x 20 cm x 0.2 cm (8.27" x 7.87" x 0.08") *Fabric & cording is stretchy and expands beyond listed dimsWeight45g (.10 lbs)Peak Design Bag CompatibilityFits 18L/25L/45L Outdoor BackpacksFits 20L/30L Everyday Backpack and 15L/20L Everyday Backpack ZipFits 30L/45L Travel Backpack and 65L Travel DuffelpackHelmet CompatibilityDesigned for bike, ski/snowboard, and climbing helmets.Not compatible with most full-cage/motorcycle helmets. Blended nylon and UHMWPE stretch fabric is recycled and Bluesign Approved PFAS-free water-repellant treatment is a more eco-friendly option to standard DWR Nylon Cord Hook(TM) connection/adjustment hardware All cording made from ultra high-strength UHMWPE for extended durablity