We have been using these: Sistema Klip It Multi-Use Food Storage Container Set, 14-Piece https://www.amazon.com/dp/B00NSJ88V8/ref=cm_sw_r_cp_api_i_Q0U6CbPHQMDAA

We only send one meal right now as our daughter is almost 8 months old. I usually do fruit in one compartment and either baked egg, waffle, or toast in the other. We also use the round Take and Toss containers to send Cheerios so she can practice her pincer grasp.