Won a bear carry the Ursack away if it is not tied to a fixed object?
Probably not. The SIBBG rangers tested the Ursack Hybrid in both the summer of 2004 and 2005 to see whether a bear would carry it away. They even put a tracking device in it as part of the testing procedure. The results, so far, are that bears are leaving Ursacks very close to where they found them.