Well, it is a POCKET Survival Pak; if you choose to go without pockets, that's a choice. In that environment the contents of the kit might not be what you need. I'm not too sure how useful a signal mirror is under a triple canopy and I doubt the whistle travels far.

An observations though: If you are cold and wet, then you should not have been in swim trunks. If you are wearing something else, is the kit still too big? Maybe consider layering your gear rather than having it in a single pack. I wear shorts a lot here in SOCAL and I could easily distribute the contents of a Ritter PSP in my pockets and it would disappear.

So what specific items do you need? What do you anticipate needing to be able to do in a survival situation. Insect repellent?