I hate carrying an over stuffed wallet so I don't. Instead, I carry one of these and love it. Depending on where I am going, I carry my driver's license, proof of ins, a $20.00 bill just in case, a credit card and one or two other cards that I use/need often. It is slim and fits in my back pocket easily. I have a larger case where I carry other cards that I don't need often..but know that if I will need them, I need to get them out. Once you get into the habit, it works. Yes...once or twice I forgot but the ease of carrying this slim thing most of the time makes it worth it. I would not change for anything....