Can I bring my own bag to Walmart?

Excuse me, I have a question about Walmart's policy. I'm wondering if it's allowed for customers to bring their own bags when shopping at Walmart? I've heard that some stores have implemented policies that encourage the use of reusable bags, and I'm curious if Walmart is one of those stores. Is there a specific size or type of bag that's preferred or restricted? Additionally, do you offer any discounts or incentives for customers who use their own bags? Thank you for your time.