What were the results of the Sierra tests in 2004?
SIBBG conducted an exhaustive wilderness study of 15 Ursack TKOs in the summer of 2004. Despite numerous bear encounters, no bears or marmots were able to access food from an Ursack. SIBBG, through wildlife ecologist Harold Werner, produced a 20 page single spaced footnoted report accompanied by hundreds of photographs and field notes. The abstract from that report is HERE. To which we add: The older Kevlar Ursacks, which are yellow, have not been evaluated by SIBBG. Theoretically, they will do well with the aluminum insert, but it is 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.
