I got this handlebar bag so I wouldn't have to carry a backpack on long rides. It is excellent for that. But you can't fit big things in it, like papers or folders. There is room for a phone, wallet, gloves, one thin packable layer, kleenex, and sunscreen. Bags of food and drink won't fit. It doesn't seem to throw off the balance of the bike, and it has an ingenious magnetic clasp that really works.
I bike during my lunch hour and use the handlebar bag to carry my gloves, masks (during COVID), phones, and cycling caps. It is easy to install and uninstall. The magnetic closer makes it easy to open the bag while moving.