Thanks to therobustnessandwater resistance,apetling(preform) is suitableasan idealmicrocache.
ClosedthepetlingisaFTFcover.Thusyou can hearwhen you first open(FTF)the well-known"click" sound.Thepetlingclosessocompletely waterproof andiseasy to hideanywherebecause of its size.