What's in your field kit?

I have a DSLR with a zoom lense that I can simply flip around for when I want to take a macro shot, some kneepads, a squirt bottle for hydrating mosses, a wide brimmed hat, and sometimes a telephoto lense. Lately I’ve been focusing on aquatic microbes and so the only thing I bring are some plastic bags to hold water. I’d like to get some gear so I can wade through streams as well as a bathyscope and then some measurement devices like a ph/ec/temp pen and a secchi disc. And a better camera with a sturdy yet lightweight and portable tripod. I probably need to look into mosquito countermeasures as well.