I took a trip out west last August. I carried a Maxpedition Monsoon as my carry on. Nothing I had in the bag was questioned. I had (among other things) a basic fire kit (with petroleum jelly soaked cotton balls, and a lighter and fire steel) a small first aid kit, water purification tablets, a pair of tweezers and a small pair of scissors in a little duct tape sheath that I made, with extra duct tape wrapped around the outside, note pad, pens and pencils, and (possibly my favorite addition) a big pencil sharpener from the hardware store that has the blade secured by a little philips head screw. Those sharpeners are great for making shavings for fire starting anyway, and being able to remove the blade just makes it that much more potentially useful if the s**t really does hit the fan.
As a side note, on the trip out I also accidentally forgot to stow my Spyderco Dragonfly in my checked baggage, and didn't realise it 'till we were getting ready to go through security. I considered just dropping it in a trash can to avoid any chance of trouble, but ended up slipping it into my little pouch that my camera rides in, and it didn't get caught. Either the TSA wasn't paying attention that morning, or it blended in with the camera on the scanner. So I got to keep a pocket knife with me on my outbound trip.
Disclaimer: I'm not recommending that anyone try sneaking contraband through airport security or anything, and I realise that I may not have made the "right" choice in hiding the knife in my bag, and that doing so could have caused all kinds of trouble for me. Just sharing my story.