The 5 gallons get mixed if you pick a non stock color, but we get them shook regardless. You pour out of them just as you would a 1 gallon container, you just have to be more careful and have a paint brush handy to clean up the drips down the sides. The biggest problem with the 5 gallon buckets is getting the lid off. A 5 in 1 comes in handy for that. also consider switching from a roller tray to a roller bucket. With the waste basket style paint buckets for rollers you can easily dump a gallon of paint into them and not waste time refilling all day long. We typically refill our roller paint buckets a couple times a day maybe three times on a long day. Plus they are much easier to carry around.