They figured out how to get in and out of the big dumpsters a few years ago after what? 50-60 years of them being in service? The dumpsters now have the latch clip on the access door. They'll figure that out one of these decades.
During the first few years of using Garcia canisters we would still have bears clomping through our camping area looking up into the trees. They would pay no attention to us. Laurel Lake area especially.
