A couple weeks ago, an Alpacka Denali Llama packraft showed up in the Surly office. Our adventurous friend, Marlin Ledin, loaned it to us, so we could try bikerafting with an inflatable boat that weighs about 2.2 kilograms. I don't have much experience in a raft or canoe...even though I've lived in the Land of 10,000 Lakes for the vast majority of my life, so the thought of getting into a little boat with a bike and camping gear strapped to it was a little intimidating. But I knew that my first outing would be on the low ‘n' slow…