Fit & Fresh Stak Pak Portion Control 1-Cup Container Set,  4 BPA-Free Reusable Food Storage Containers and Ice Packs, Healthy Lunch and Snack for School/Work MATERIALS YOU CAN TRUST: Containers are BPA-free, dishwasher safe and microwave safe. SET CONTENTS: Portion Control Set includes (4) 1 cup containers with (4) lids and (2) ice packs KEEPS FOOD FRESH: Ice packs snap right into the containers lids to keep contents cool until lunch time FUN COLORS: Multicolored lids to make lunch time colorful and more enjoyable STACK EM: Containers snap and stack together for easy packing and storing