I crush these bottles under my bare feet. I start with some watter bottles then a hard plastic bottle and end by curshing a milk jug with the lid tightly screwed on. You won't believe how strong the milk jug is!

I crush these bottles under my bare feet. I start with some watter bottles then a hard plastic bottle and end by curshing a milk jug with the lid tightly screwed on. You won't believe how strong the milk jug is!