Amazon has this Rubbermaid LunchBlox Entrée Kit, Green 1806233
For $8.96 as an add on item.
Modular lunch containers snap together to save space and stay organized, and can be stacked to fit various lunch bag shapes and sizes
Blue Ice freezer packs snap directly to lunch containers, keeping food chilled when you’re on the go
Durable containers have a secure lid seal to prevent leaking
Kit includes 1 Entrée Kit with dividers (4.1 cup capacity), 2 Snack Containers (.5 cup capacity,) 2 Side Containers (1.2 cup capacity), 1 Medium Blue Ice and 1 Small Blue Ice. (Size: 4.81″ L x 8.625″ W x 5.25″ H when stacked)
Microwave, dishwasher and freezer safe, BPA-free