Paying to check in airline luggage may be the best-known service fee consumers face regularly, but it's not the only one. Almost any transaction can come with a small fee that can really add up.
In recent years, added fees have become a hidden way for companies to increase prices without actually increasing prices, said Mitch Lipka, editor of The Consumer Chronicle.
The best thing consumers can do is watch for them. Here are some service fees and ways you can avoid them.