In my Swing Bag collection, the bags are open at the top with a snap closure and are approximately 8 1/2" x 7". The have one interior pocket.
Many of the Swing Bags like the two shown here are crazy quilted from decorator fabrics and embellished with decorative stitching as well as beads along the bottom edge that swing nicely when carried.
The red bag below is from a special collection I created for valentine's Day. Though most of the bags had a definite heart theme, this particular bag could be worn on other occasions as well.