I like my glasslock. Glass body, plastic/rubber top. They seal incredibly well, you can turn it upside down and shake and it won't leak.

Just don't microwave it with the top on. I just toss a damp paper towel over it before microwaving.

Yes, glass and stainless steel containers with air-tight lids exist. Some use a silicone or natural rubber gasket for the seal.

If you can't find those, canning jars (Ball, Mason, etc.) have been around for ages, and you can always wash and reuse empty jars that once held food from the market. You can avoid food contact with the lid coating by keeping the jar upright.

When I need a microwave-safe lid, I find that a damp paper towel or upside down plate works well.

Jars

Ikea has plenty of options, with either plastic lids or bamboo and silicone (neither of which are microwave safe)