u/Head-Shame4860

I've been making myself a crochet/knit organizer (I'll be crocheting the accessory pieces), and recently changed my design to the picture seen here! I have a question: is 1 button to keep this closed enough? I originally only had 1 button clasp at the front because I was going to taper it like a closed letter, but I changed it (along with other things) to make the design smaller and more streamlined, to fit on a belt and unfold on a table nicer. But, since I'm keeping the front a rectangle instead of tapering it, do I need 2 buttons at either end so it doesn't flip open on me...?