It says here they can be inflated up to 20 times their size!

Yuki to Kurumi, Chapter 3 (page 14)

In chapter 3 (and episode 2), Yuki and the others went on a test of courage. Their first stop being the school store, Yuki runs off to find some candy and the balloons. She was surprised by the fact that they can be inflated up to 20 times their size that she decided to take them.

In chapter 6 (and episode 7), these balloons were used to fly letters.

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