These are what I've been using.
https://www.amazon.com/gp/product/B01GH5KQLO/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
Freshware Meal Prep Containers [15 Pack] 3 Compartment with Lids, Food Containers, Lunch Box | BPA Free | Stackable | Bento Box, Microwave/Dishwasher/Freezer Safe, Portion Control, 21 day fix (32 oz) https://www.amazon.com/dp/B01GH5KQLO/ref=cm_sw_r_cp_api_BKozAbTSQB3Z0
These work great and are pretty inexpensive. Microwave and dishwasher safe, no-muss & no-fuss!
For non-twitter users: https://www.amazon.com/Freshware-Containers-Compartment-Stackable-Dishwasher/dp/B01GH5KQLO
Me and at least one of my coworkers bought these and they are great for meal prep!