Which Hydroflask should I get?
12-24 oz Hydro Flasks Are The Skinniest and Best For Fitting in Cup Holders. The smaller sized Hydro Flasks (from the 12 oz to the 24 oz) in both the standard mouth and the wide mouth have the smallest diameter. This means they are more likely to fit in a cup holder and will be easier to hold with one hand.
Which HydroFlask is most popular? The most popular Hydro Flask size is the 32 oz Hydro Flask which is the best selling and most versatile size.