If he were truly meticulous, he would have had two of everything. A second, "sterile" backpack and second jacket to drop, for sure. (Both the dirty and clean one acquired separately for cash months before, of course.) Someone else's discarded water bottle picked from a trash can, identical to the one he bought.
That's really the big question for me now. How many layers of safety factor did he build into this? If he didn't, seems like a big ask that they wouldn't recover some hair or dandruff from at least some of these items.
And it would be interesting to know what the true state of art of AI is. Gait analysis - this is already a usable biometric, I understand? I'm assuming that the government has systems that are a year or two ahead of anything in civil commerce, and they don't let on. Even if the brute-force camera footage collection can't keep up for now, I suppose they could also save the contents of every last camera in the region on a giant drive and wait until AI was advanced enough to analyse every shot, run process of elimination, cross-reference to times and schedules - doing this in reasonable, "polynomial time", so to speak.
He'd better hope that enough of those security cameras at key points along his escape path are/were inoperational or garbage...