Fabric:
Upper Shell - 2 yards 60" wide or 3 1/8* yards 45" wide
A lightweight, Waterproof-Breathable fabric will be best for the top half of the sack. A shell fabric that is only water repellent can be used if warmth and staying clean are your primary concerns.

Lower Shell - 2 yards 60" wide or 3 1/8* yards 45" wide
Lightweight Coated Nylon is best for the bottom half. It should be waterproof, breathability is not necessary. Coated Taffeta is recommended.

1 yard Mosquito Netting (No See Um) 45"-60" for optional insect hood
6 inches Leno Mesh for visor

Notions:
28" -  1" Webbing
37" - 3/4" Velcro
34" - 3/4" Velcro for optional netting hood
3" - 3/4" Velcro for optional stash pocket
Seam Sealer only if waterproof shell
Polyester Thread
*This amount of 45" wide fabric will make a sack with no cross-body seams.

KIT Available - Bivy Sack Prices Without Upper Shell Fabric!