If you have no other use for the deflated Mylar balloons, simply save them to be reinflated on another occasion. If you insert a straw at least 6-8 inches in length up into the hole where it was originally inflated, you can press out the remaining helium in order to store the balloons flat. The straw has to be inserted beyond the point of the interior "straw" which enables the pressure of the gases inside the balloon to seal the helium inside.
Once this point is passed, the remaining gas inside can be releases. Sometimes the opening of the inflate hole is semi-sealed with a sticky substance but carefully working the end of the straw up through that spot should be fairly easy. I've not seen a Mylar that I could not deflate entirely.
You can buy small helium tanks to reinflate them yourself or ask the local party store what they'd charge for helium only. Some won"t charge as much, others will charge almost as much as a new filled balloon, but it doesn't hurt to ask. Especially if you are buying additional supplies or additional balloons.
By leslie
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