Can I fill reusable bags with products from the bulk bins, or am I required to use the plastic bags at the store?

My wife and I use reusable bags all the time. They've been great with tare weights. You can even use a reusable container if you make note of the containers weight before filling it up with bulk products.

Never had an issue with them

Yep. You can use your own containers. They are pretty nice about it too. If you forget to weigh your container at home, they will weigh it at the cash register too.

Plastic bags from store, I believe, but you can call them to double check. It would be wonderful if they did allow us to use reusable bags in this day and age.

Plastic bags