Showers aren’t the only place a shower cap can be useful.
Muddy day at the track? Crowded in the grandstand? Save the shower cap from the hotel and place your shoes in it before packing them back into your suitcase. This will save your favorite race day dress from meeting the unfortunate race day mud that stuck to your sandals or stilettos.
Saving the shower cap for your shoes, saves you from extra laundry and disappointment from ruined clothing.