Hi Fred, while we recommend storing your flour in an airtight container so that it doesn't absorb too much moisture from the air, we have a suspicion that there may be other factors in play during your process such as oven temperature or the temperature of ingredients. To further discuss your process and figure out why the popovers may not be popping 100% of the time, give our Baker's Hotline a call at 855-371-2253. We're here M-F from 9am-9pm EST, and Saturday and Sunday from 9am-5pm EST, and we'd love to talk popovers with you!

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