Double the utility of your Fifth Season sack with this Fifth Season Shoulder Strap.  Sure you could use a length of jute rope stolen from a drunken sailor, but that has potential dangers.  This strap is a safer bet.  Works with the Squall sack, Simple Squall, Switchel, Vortex, Blizzard and Eira sacks.  

Hemp webbing with steel hardware and a hand stamped leather label.  Sewn in Middlebury Vermont in a one gal workshop.  Adjustable length, the listed size is max length.  I (James) am 5'9" wear a size large T shirt and the 50" fits me, for reference.  

50" or 60" sizes.