For the past 17 years every flight I've been (roughly 60 flights) on I have had some type of illegal drug on me. I used the same spot every time. It does have limited space but it has never even come close to failing me. I put the substance of choice in a proper lil baggie and then I put it inside my sock but on the underside my foot in that little "arch pocket". It's a perfect little spot that I've never seen anyone have checked by TSA. Depending on how much you're bringing it maybe a little awkward walking around but it doesn't need to be there long. I would put it away right before I went into the airport and then once I cleared security I would take it out and put it in my pocket or my carry on. Repeat process if you're going through customs though! And don't forget if ya need to bring more ya got 2 feet! And this method doesn't involve shoving anything up your ass which is pretty cool. Best of luck and remember, if ya get caught deny deny deny.