The Hydro Flask Wide Mouth Flat Caps are insulated to aide in keeping your Hydro Flask contents cold or hot and at the optimal temperature. It fits our wide 18 oz, 32 oz, 40 oz and 64 oz Wide Mouth Hydro Flasks.
- Please note that the Flat Cap does not fit on the older style Wide Mouth flasks. Only compatible with Hydro Flask Bottles.
All prices are in USD.