There are certain things you can expect from a hotel room.
Clean sheets and towels should (hopefully) come as standard. There are normally some free toiletries thrown in.
Fancier places may have a mini bar and some tasty snacks on offer.
See also: Your worst ever hotel experiences
And of course there should be a hairdryer - one of the perks of staying in a hotel is that you don't need to lug yours round with you.
But you may actually want to start packing your own one.
A past investigation by ABC News uncovered some grim truths about hotel hairdryers.
Namely, they're more germ-infested than a dirty toilet which, in a way, makes sense. While the toilet gets a regular clean, hairdryers tend to stay hidden away in drawers.
Chuck Gerba, the microbiologist in charge of the experiment, swabbed nine different hotel room items.
See also: Revealed! The dirtiest place on a plane
He made sure he visited a range of hotels, which varied in price from £60 to £302.
"There must be some things you can do with a hair dryer that I am not aware of because some of them were pretty germy."
It's believed this "germiness" occurs because cleaners will focus on items like the toilet, bath and sink in a hotel bathroom.
Other objects which are frequently touched, but may not be as obviously "dirty", are things like hairdryers, kettles and the light switch.