Ursack Update

February 16, 2006
Many customers have asked whether older Ursacks may be retrofitted with the aluminum insert. Here is the answer from Harold Werner of SIBBG: "It does not matter whether they are using the Spectra (green) or the Vectran bag, just as long as it contains the heavy-duty insert. I consider the two materials interchangeable. It is the insert that makes the difference."

The older Kevlar Ursacks, which are yellow, have not been evaluated by SIBBG. It is extremely unlikely that such bags would be considered "conditionally approved" for the Sierra. Also, we have changed the construction of the bag itself since our early days with Kevlar, and the aluminum does not fit precisely. You will probably have to trim the aluminum with metal shears to make it fit right.