Where is your wallet?

I am super paranoid about my wallet, belongings, bank account, internet access, etc. I think that's simply unbelievably dangerous to let anyone get hold of those. I regularly check all accounts online and check any abnormality. When going out to any sporting event, I only take 1 credit card, 1 cash card, 1 Hong kong ID card and some cash, all in a dirty zip-log bag (looks dirty because it has been used many times over the years, they only get replaced if broken). On Wednesday the national day, we first went swimming with Uncle KS early in the morning. So early we had to leave our place by 7am. Hiked for 30 minutes to get to the natural pool by the hillside. That was the abandoned reservoir - the clear fresh water running down from Ma On Shan and collected into a pool - the dam cleverly creates a 40-50 meter long pool. We swam for hours then rushed to our skating meeting point in another station in New Territory. As we arrived in Tai Po Market station, there are so many people around (some said because of occupied central hence the mainland tourists can only visit the shopping malls in New Territory). I then checked my pocket and couldn't find the plastic bag anymore, not in my back pockets, not in my front pockets of my running shorts. I started to go through my running rucksack, nothing in the internal compartment pocket that's where I normally keep the keys and money (very hard to access even if pickpocket can unzip the rucksack). Not in the bottom of the bag, I started to panic and concluded the plastic bag is lifted. I then quickly called the credit card company and bank to cancel those, only need to deal with the Hong Kong ID, which is also the pain. I still have the travel card, just bad that I don't have any cash for a while. We then walked around the station to sit under the tree putting on our skates getting ready to leave - I am still trying very hard to think when was the last time I saw the plastic bag. While putting on skates (it takes Jon forever to put on all the protection gears) Jon asked me if I check the waterbag compartment (the water bag compartment is to hold the camel bag from which the long tube is extended to front, so that you can re-hydrate without stopping, very convenient if going trail running). I then remember I tugged the plastic bag into the water bag compartment and thought it is very very secure because the opening is so secret that no one can see where to unzip it, and no one would think the money is in the water bag compartment, including myself.