The camelbak mag chute Mag water bottle is the absolute best for otf. I’m a dedicated hydro flask 40 oz girl, but the fact they didn’t fit in the tread cup holder or have a quick sip lid killed it at otf for me. The 32 oz...cant speak to the other sizes...fits in the tread cup holder. The cap will stay to the side with the magnetic thing so you can leave open. 32 oz is awesome size for otf. I usually never have to refill except at the end of class. They have stainless double wall or reg...I went for double wall and cold water for a while definitely all of class and longer if you need. Plus they just came out with a newer model so you can get certain colors of the older version which is what I have for like 25 bucks Edit for link and the price...initially put 20 oz price.