It depends on how big of a flask you have.
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The capacity of a flask can vary depending on its size and design. However, common sizes for flasks range from 4 to 10 fluid ounces.
I don't know, how many ounces is your flask? Seriously though, flasks can come in different sizes, so your question is not specific enough.
8 fluid oz = 1 cup 16 fluid oz = 2 cups
1 Imperial fluid oz is 28.4131 mL 1 US fluid oz is 29.5735 mL
2.2 liters is equivalent to 74.4 fluid ounces.
0.14 fluid oz = 4.14mL (rounded from 4.140294mL).
There are 8 fluid ounces in a cup.