Flexible Material: Flexible BPA-Free material that resists cracking (up to -13 degrees) and adapts as frozen food expands. Airtight Lid: Locking in freshness. Modular System: Designed for easy stacking. Arched Base: Helps circulate air better encouraging faster freezing. Nestable: Nests with other sizes for efficient storage when not in use. Dimensions: Green 450ML: 15.2 L x 11.4 W x 6.2 H cm Blue 1L: 22.7 L x 15.7 W x 6.2 H cm Green 1.1L: 15.2 L x 11.4 W x 11.9 H Capacity: Green 450ML: 1¾ cups/450 mL Blue 1L: 4 cups/1 L Green 1.1L: 4.4 cups/1.1 L