Only if you want a sport bottle type cap. It comes with a screw top that has a place to put a loop thru. You've made a great choice. I won't buy any other type of flask again.
Be sure to check out the limited edition 4th of July HydroFlask they released this morning! It's pretty!
I talked to the company rep recently. Pink (and purple) will be out very, very soon. I believe pink was the middle of July.
Just got 3 more, LOVE these! (Just wish the sports cap would stay in stock!)