I do not like plastic water bottles, either bought full of water or refilled by me. I don't like a plastic taste and puting lip to spout doesn't seem too good, especially when riding in mucky conditions. I do like the double walled stainless steel ones even though mine have a screw on cap instead of a flip up spout. I don't mind stopping for a moment to unscrew the top and have a drink and have to stop at times for a light or a whiz anyway. When the temps are raw, I really enjoy having a hot drink, even if only water, and my bottles keep it that way all day. My bottle cap goes in the washer, but the bottle does not. I ride for exercise, and Zen ( probably endorphins TBH) and a little extra weight don't chap my bottom none.