[NB] I've made lots of comments on everyone's pics & been listening to you all wanting a larger cup. We're going to attempt to make a larger cup & want to hear everyone's input on size. The Frohle Extreme which is the most popular is 4.75" L
Drinking enough and good stretching is very important, when you're hiking through the mountains. Would you like to assist me with my exercises? I am open for sportive ideas!