I have been using Hammer flasks for over 10 years, $2.39 each. I buy the Hammer gel in bulk and pour it in. When the bike is moving, I take it out of my jersey pocket and take a squeeze. Vanilla flows great in cold weather. I open the flask with my teeth, squeeze, and close the top by pushing the top against my hip. The whole procedure can be done with one hand. I put the flask in the upper rack of the dishwasher, upside down and the top in the utensil tray.