I love your idea. It is lightweight and practical. My notions fit easily into a zippered bag much like yours which I slip into a tote bag with my fabric no pattern. The mat and rulers are the most awkward. I once had a case for my mat with pockets, but it was bulky and inconvenient for my tools. When I go to retreats, I am concerned with the weight of my stuff. I want to stack everything onto my rolling sewing machine case and one shoulder if possible.