It's estimated that more than 5 million people will travel by plane this holiday season. With so many travelers taking flight, that can mean a lot of time spent grounded at an airport. Don't be that person who holds up the line because of your shampoo bottle or pocket knife.

If you're still unsure about what you can or can't bring on a plane, then have a look at this gallery from TSA's Instagram account featuring items that won't fly.

To see a full list of what to skip when you fly, click here.