It's not obvious in this photo, but the zipper has been sewn closed at the bottom.

Creation Date: 2012-09-15 07:10:40
Modification Date: 2012-09-15 07:10:56
Camera: NIKON CORPORATION / NIKON D5100
Lens: Nikon AF-S DX VR Zoom-Nikkor 18-55mm f/3.5-5.6G
Aperture: f/4.8
Focal Length: 32 mm
Exposure Time: 0.016666666666667
ISO: 2500
MeteringMode: 5