the shampoo bottle idea is a good idea but who takes shampoo to the beach?.....a better idea is to take a disposable diaper....dampen it so it feels used....put your valuables in a zip loc baggie and wrap it in the diaper....folding it like a used diaper.....i guarantee you no one will steal a used diaper!!!

bottle brush is also a round brush....used to be used to clean out baby bottles...hence the name.... they still sell them but for cleaning out other small opening containers.........the plant was named because the flowers resemble a baby bottle brush....