What is the best method for seaming up the sides of a bag?

I’m making a bag (it’s knit flat and will be seamed up the sides, right sides together). What’s the best method to seam it together?

Thanks in advance! :smiley:

Mattress stitch is the one generally used for this situation.

Scroll down -

More help here -

Thanks, Jan! I learned the mattress stitch and it looks great! :cheering: :cheering: :cheering: