I have probably made over 200 of these bags and was never aware that the numbers to face one way or the other. The original class that I took just told us that one way the bags opened quietly and the other way they made a pretty loud click. I think early on I did do one reversible. I would certainly make one that could be reversible and before sewing the final seam closure try it out. You may have to make them just a little larger so they will be easy to turn. Also, if the fabric is heavier than usual I cut two pieces of tape for each side and it give a nice firm closure.