These mini labs were created out of the need to teach customary and metric units of capacity in an investigative setting. Each lab was assigned to half the class for the first day and then flip flopped for the second day. By using a hands-on approach, students in my class understood how much each measure actually contains. They walked away from the investigations with a mental image that made this type of learning concrete. Remember that you cannot teach size with paper and pencil! The lab uses beans instead of rice. Rice will turn into grain bugs and cannot be used year to year.