I honestly don't recall ever having stolen anything but I usually ask the room cleaners if they have a few spare shampoos/conditioners (the small bottles they fill up each morning) for my daughter when she is away at dancing competitions.
They usually have a trolley on each floor with literally hundreds on them so a couple never get missed.
I'd rather be honest and up front than have them talking about the guy that uses all the shampoo and conditioner every morning but never seems to leave the empty bottles