For 6 sided you don't really need bias binding, just straight will do as your sides are straight. Bias is critical when you have curved edges to work with.
Just bind as you would a 90° corner .... you stitch to 1/4" from the corner, then flip the binding back and over, to lined up with the next side. Continue on to the next corner etc.
Then turn your binding to the back side to do your hand sewing. When you get to the corners, again, you are flipping and folding to fit with the 60° angle.
It's no harder than your regular square corners ... just that we make it so in our mind, all because we haven't done it before!!
