Haven't had trouibel yet. When they view it as I always 'carry on" they open it and seem amazed at all the stuff I am carrying but none have pulled out the 500mm (yet!!!) but TSA seems to grasp medium format as opposed to 35mm as I always had them look through my Nikon gear in the f64 bag. Can't keep them from touching so I don't even try I just stand there and watch and often politely answer questions. Hasselblad is a important word or is too confusing so they don't damage anything. I don't ever carry a Leica as I would be swallowing my tongue.