Sew in place. I used a ‘box’ stitch. Do the same to all 4 ends of the straps. Remember you want one strap on each side of the tote bag. Don’t have your straps going from the front to the back, this will limit your top opening to get things into it.
If you chose to use webbing
With a match or a lighter, gently melt the ends of your webbing. This will stop it from fraying. Position and sew in place the same as the fabric straps.
Tip: With either fabric straps (cheaper and they will match) or webbing, SEW SLOWLY You are going through a lot of thick nesses. I also recommend using at least a size 14 needle when doing this.