Amazon has the Rubbermaid LunchBlox Kids Tall Lunch Container Kit, Blue/Orange/Green, 1866739 For $4.98 add on item.
Features
Colorful modular lunch box 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 food containers, keeping your child's lunch chilled when they're at school, on trips or more
Durable containers have a secure lid seal to prevent leaking
Kit Includes: 1 Sandwich Container (2.6 cup capacity), 2 Side Containers (1.2 cup capacity) and 1 Medium Blue Ice freezer pack (Size: 4.8 " L x 5.6 " W x 5.3 " H when stacked)
Microwave, dishwasher and freezer safe, BPA-free
