I wouldn't use the clear shampoo bottles, they don't seem as sturdy as the others. In fact I have about 15 suave bottles I decided not to use. If anyone wants them, PM me and I'll send them to you.
And just go to any tennis club for the tennis ball containers. They'll collect a whole bag for you in no time... even used tennis balls if you can figure out what to do with a hundred of them!
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