Keeping the water filter in your coat pocket is actually a smart move. I’ve always kept mine tucked inside my pack, but you’re right, it’s way too important to risk leaving behind if you have to rush out. For me, water is the number one worry when you’re away from home comforts, so I might start carrying a small filter in my jacket too, just in case. I do keep a thin bandana in my other pocket—works for filtering out debris from water in a pinch or even for bandaging, keeping cool, that sort of thing. People underestimate those little multi-use items.
It’s funny, after years of prepping, the things I actually reach for tend to get smaller and lighter. Started with whole kits and now half of what I truly depend on fits in my pockets. Anyone have a brand of water filter they trust most, especially one that holds up after long storage? Mine’s a Sawyer Mini, but I’m always curious what’s working well for others.