It's solid but not too heavy.
It's flexible and crinkly.
A few weeks ago my husband placed the container under Jesse's feet and the kicking began.
Jesse heard the crinkle and felt his foot thud, and delightedly repeated his kicks.
The other day Jesse and I played on the bed. He had held, bite and tossed aside a half dozen rattles and stuffed animals. I absentmindedly handed him a half empty wipe container. He grabbed it, heard the crinkle, and shoved the container towards his feet (already kicking in anticipation).
Hmmmm.
Again and again I put the container in his hands and he moved it to his feet.
How about that? His first game:)