So I'll be going to Silverton CO on Fed 18 to study avalanches for a week with my school. Since we'll be out on the mountain all day I'm looking to pick something up for rehydration. If possible I'd like to be able to use it in the summer for biking as well. I've been trying to look at their site, but for some reason it isn't working too well. I'm not sure how well the two activities cross over between the different models ie. the winter models have no ventilation for biking and the biking models water might freeze in the tube. Any suggestions from those in the know.