They have gps dog collars so hunters can find their dogs, that is about the only thing and way too expensive. Try hanging it like a bag and mark the tree, or tie it to a tree. Seriously though, how often do you get animals walking off with the canister?...you in Yellowstone or Yosemite? I have always used a bear line and a bag. It takes a bit more time, but is lighter and I never lose it...that is unless it is a really motivated and smart bear.