Boulder is a cool outdoorsy yet techy town. Somehow it seemed appropriate to name this design after that town.
- Works with 1st generation Hydro Flasks, Simple Modern, Takeya, Thermoflask, Nalgene and many other brands of wide mouth water bottles.
- Easily interchangeable with other chill water bottle handle designs to fit your mood, outfit, or activity.
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Voted #1 new hydro flask accessories by a small group of random people.
- Does NOT work with newer version of HydroFlask.
- Plays well with Hydro Flask stickers.
- Reversible.
- Works great with hydro flask straw lids.
Be sure to follow the installation instruction and put the ring below the bottom rung so the lid can seal properly. Use a blow dryer to heat up the ring if it's being difficult to push under the bottom rung.
