Up Close with the Aeronaut 45 in Black Halcyon 400d Halcyon 400 denier is the big brother of our Halcyon 200 denier, and in a way, a cousin to 420HT Parapack. Made for us in Japan, it's a ripstop fabric woven of 420 denier nylon (base fabric) with a square grid of 400 denier UHMWPE (ultra-high-molecular-weight polyethylene) yarns every .25" / 6mm. UHMWPE is one of the strongest fibers known to man, and is almost impossible to tear. The Aeronaut 45 is now in stock and ready to ship in the following Halcyon 400d exterior color combinations: Black Halcyon/Ultraviolet Black Halcyon/Wasabi Black Halcyon/Northwest Sky Nordic Halcyon/Iberian Nordic Halcyon/Northwest Sky 2 May 2016 8:23 PM Design, New Designs No comments TB Crew We're the TOM BIHN crew: we design bags, make bags, ship bags, and answer questions about bags. Oh, and we collaborate on blog posts, too. ←Pilot vs. Co-Pilot vs. Night Flight: Personal Carry-On Item Showdown Forum Spotlight: Five Questions for Mausermama→ Leave a comment Name Email Message Please note, comments must be approved before they are published