From Michelle Patterns:
Stitch up a pretty zip top wristlet with this simple SEWING PATTERN.
This bag features a pleated exterior, one roomy interior pocket, and a simple knotted strap that doesn't require any hardware.
The interior pocket is set into the lining fabric and has a curved opening that makes it easy to slide your hand inside. The pocket is 4.5" (12cm) deep, 9" (23cm) wide, and has a 4" (10cm) wide opening. So it's not super deep, but is wide and very roomy.
Finished Dimensions
7" high x 11" wide x 8.25" zipper opening x 3.5" deep x 8.5" strap with a 5.5" opening for your hand (18 cm x 28cm x 21cm x 9cm x 22cm x 14cm)