C CREST [10-Pack] Glass Food Storage Containers with Lids, Airtight, BPA Free, Meal Prep Containers for Kitchen, Home Use

What sizes are these containers? How many cups do they hold?

One of my tops chipped. I can't find your normal customer service information or a way to contact you. Would you be able to provide that for me?

Are the glass dishes stackable inside each other for storage when not in use?

if it is oven safe can you put it in the instant pot or air fryer?