Used them for the socially distant Big and Little Reveal by filling them with paint and water. I didn't quite fill them up to the size I would use for outdoor play as I had to transport them in the car without damage so I can't speak to their full size durability. However, NONE of these broke during filling (I used 47 in total) or during shipping, and each of them fitted perfectly onto the canvases (which were reinforced with buttons, but still). Even the ones that hit the ground burst. Therefore, they could pop at 1/2 when thrown. THEY WERE DARK ENOUGH TO COVER ALL COLORS EXCEPT the red for some reason. The balloon had sections that stretched to show a slight shade of orange so if you looked for a color you would find a clue could. For reference I used the colors green, pink, yellow, blue, orange (all neon), then a darker red and purple. In my experience they are perfect for revealing the floor when using neon colors.
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