Doesn't matter if it opens on one side or two, they open. I had a Bucket Boss tool bag lose one of the loops where the strap attaches, just as I put it on my shoulder and turned to walk away from the van. It had rained, so the ditch where it landed had some standing water. Good times. Good times.

BTW- that tool bag fits three of the larger parts boxes with yellow clips and since the boxes are significantly lighter than my tools, I retired the old bag and use it when I need to carry multiple parts boxes.