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I keep reading about people taking new toothbrushes...I must be missing something...Why not take the current ones you are using?
The air still seeps back in after 24 hours or so, but they still pack better than without them.
We've been doing the same. This year, though, I am making everyone help - even the 3yo. I give them little jobs. Even though it takes them FOREVER to do their job, something gets accomplished, and I can get other things packed while they are working on their job.