I also have a 12 oz insulated bottle and a 20 oz coffee cup from Hydro Flask, along with various caps (standard, sip-top and pour spout), and all of the caps work on all of the bottles.
Buy Equation 3/2 FX (men's) from Picture Organic Clothing Buy Equation 3/2 FX (women's) from Picture Organic Clothing The Equation from Picture Organic rightly also has decent eco-credentials.
Some results have been hidden because they may be inaccessible to you