I would think a pressure cooker full of hardware would be heavy.
Surely there are surveillance cameras in that area that would pick up on somebody carrying TWO unusually heavy and/or cumbersome backpacks.
I was thinking the same thing. And would it cause a red flash and smoke? Maybe it was steam but would steam linger that long in the air?
That's what I was thinking but then these were supposedly the 6 liter size which is one of the smaller sizes at about 6 lbs. Two of them filled with BBs or whatever would be a considerable amount of weight. Then he'd have to have two backpacks and maybe more weight like a change of clothes, etc. to throw off any suspicion just in case. Even carrying two backpacks wouldn't have caused anyone to suspect anything as he could have been holding them for two racers. I can see leaving them beside a trashcan but the act of putting a backpack inside a trashcan would likely be noticed. And to get by with that twice would be too risky but what do I know.