pair flip-flops / flip-flops

People may have such this problem when they are playing on the beach: where is my other slipper?Our solution is that cutting a gap in the heelpiece of the flip-flops, just like the gap between the big toe and the index toe of human being. So they can join together tightly in reverse overlapping position, and never be took off.
Next time, when you are going for the beach, you may hang the flop-flops on the bag. You never be afraid that the slippers are lost, and they never take up more rooms of your bag.
Besides, this design can make a lot of convenience for storage and transportation.