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Watch those sippy cups while on a plane

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in: Food & Mealtime, Travel & Outings

Pressure changes during air flight can cause spillproof sippy cups (the ones with valves) to leak. Fill them halfway, and unscrew the top a few times during the ascent to equalize the pressure inside and outside of the cup.

Another option: use sports bottles for airplane travel.

Tags: Family travel, Sippy cups

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About Asha Dornfest

Asha Dornfest is a writer, parent, and insistent optimist living in Portland, Oregon. She is the author of PARENT HACKS, co-author of MINIMALIST PARENTING, and co-host of the Edit Your Life podcast.

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Comments

  1. Dan says

    January 13, 2006 at 4:49 am

    This will even happen on car trips that go through different terrain (which we learned the hard way). Open it up and ppppfpfffttttttt! My advice: always treat a sippy cup like a bottle of seltzer, and only fill it with water!

  2. AW says

    January 13, 2006 at 6:01 am

    This will also happen if you leave a sippy cup in a hot car all day. Sour milk all over your front seats doesn’t make your car smell very nice. 🙂

  3. Terry says

    January 13, 2006 at 7:05 am

    This phenomenon can happen with Dr. Brown Bottles if you place it in hot water without unscrewing the cap.

    We loved the Dr. Brown’s bottle as our 1st child would only use them, but the day care kept saying they leaked. Pish-posh. It was the science behind the design and thermodynamics… I later found this out and would unscrew the top during heating the liquid and viola!

    I imagine the pressure change would affect the bottle very simuliarly

  4. Walter Underwood says

    January 13, 2006 at 8:19 am

    Even more fun, fill them with something carbonated and watch the periodic geyser action. It builds up enough pressure to overcome the valve resistance and releases a squirt. Then it does it again! Whee!

  5. Larry Wright says

    January 13, 2006 at 6:15 pm

    I’m generally dissapointed in how well those sippy cups work. They seem to fail more often than not. We’ve been more happy with the Evenflo and Playtex ones, but they’re still not great (IMO).

  6. laura says

    January 14, 2006 at 9:34 pm

    The same thing will happen with the Rubbermaid drinking boxes …

About the Author

Asha Dornfest is a writer, parent, and insistent optimist living in Portland, Oregon. She is the author of PARENT HACKS, co-author of MINIMALIST PARENTING, and co-host of the Edit Your Life podcast. More about Asha »

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