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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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!
Posted by: Dan | 13 January 2006 at 04:49 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. :)
Posted by: AW | 13 January 2006 at 06:01 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
Posted by: Terry | 13 January 2006 at 07:05 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!
Posted by: Walter Underwood | 13 January 2006 at 08:19 AM
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).
Posted by: Larry Wright | 13 January 2006 at 06:15 PM
The same thing will happen with the Rubbermaid drinking boxes ...
Posted by: laura | 14 January 2006 at 09:34 PM