Spider-Man is chock full of collectibles. You’re meant to grab tokens from fighting crime and clearing out bases to upgrade and build new suits for Peter Parker. My favourite collectible, though, is the mementos you find in Peter Parker’s backpacks around the city.
These backpacks aren’t hard to find; they’re not especially cleverly placed or hidden. The pay-off for picking them up is that they contain little pieces of Peter Parker’s past within them.