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I have found these bags very helpful for my pumping journey. At first I too thought the measurements were off however I’ve found that you just need to unfold the bottom of the bag whilst pumping (works when there’s at least 30ml in the bag already). The milk will then drop down fully into the bag and give roughly the correct measurement. Love the handy tab which allows me to record the date and time the milk was expressed....I just use a normal biro so it doesn’t rub off.