It seems harder to be inconspicuous with 40 lbs of explosives taped to your body than to wheel it around in a carry-on bag.

Have you seen the size of the average American? Throw on a staypuff marshmallow parka and you'd look like 40% of travelers this past week

Sure, you won't look larger than the average American, but they grew that size over months or years and move naturally with the extra weight.

Strap on 20 - 40 lbs of extra weight and you won't move naturally anymore, at least without lots of training.