Learning Resources Litre Set. This set can be filled with both liquids and solids. Graduated, clear containers help demonstrate the relationship between volume, mass and shape. Set of six containers includes two triangular containers, two circular containers and two rectangular containers. Two of the containers will hold 1 litre, three will hold 500ml and one will hold 250ml. All of the plastic containers measure 11cm in height. Suitable for ages 8+