Before we get into the question, I'd just like to say that this isn't specifically for Spider-man, but more of a general "character who moves around a lot and finds themselves upside-down quite often". There are plenty of characters this question could be applied to, and that's where this question is coming from.
Anyway, on to the question.
What type of Pockets should Spider-Man wear on his suit?
In Spider-Man: Coming Home, the question of being able to carry things with him without needing a bag is brought up, so he thinks about installing some pockets in his suit.
But pockets wouldn't work. Hanging upside-down and swinging around will just make things fall out of them.
Zippers might be useful, but the loud sound they make when opening them might make them impractical, like with other ways of keeping pockets shut such as Velcro. Buttons would be silent, sure, but would be very time consuming to open and close, as well as the problems of them potentially falling off.
So here's the criteria:
- It must be able to be a pocket that can be closed shut like a zipper, able to keep things from falling out when hanging upside down
- It must be silent (or at least pretty quiet) to open and close
- It must be quick and easy to open and close