Agree with others. Check with the TSA site. But just in case - because sometimes the personnel can be arbitrary - take a padded envelope that will fit whatever cherished item(s) you might not want confiscated. Take stamps to put postage on it.
Four years ago, even though I checked the site, I forgot about the scissors and knife in my Swiss Army card tucked into my wallet. Fortunately, I was able to step out of line and post it home. Not an expensive item to lose but my DH had given it to me and I feel sentimental about it.
In case you've never seen it, this is a great gift item. Fits into a wallet. You can get them for between $20 and $25. No affiliation, just a very satisfied user of it.
http://www.victorinox.com/category/1/100/1009