I've never had a proper tool bag before. As a home DIYer I've just had loose tools on shelves in the garage. I finally got fed up of running up and down stairs to get the next tool I needed on a job. This thing is great. I can fit most things in and I have a few other tools to add - like some scissors to stop borrowing the kitchen ones. I may even get a shorter, wider one for longer tools that are less frequently used.
Let's see your tool bags and setup.
It's a Klein canvas bag. The two belt straps to close it are a pain so I just don't "lock" it closed, a zipper would of been preferred. I love the metal rail going around the outside though, it keeps it wide open for easy access. There are pockets on the inside but they're all like 8" deep and a lot of my smaller tools get lost in the pockets and can be a pain to get out. So I bought the Gedore belt pouch for better quick access to all the most used tools and keep the bigger/less useful stuff in the bag.
I'm big on buying made in USA or union/fair wage stuff which limits my options, this is the best setup I found so far.