Zoom 2
Ideal for Canon's Pro 1, Olympus C-8080 and Nikon's 8800
Designed for compact digital SLRs with a lens up to 3" attached
Internal Dimensions: 5" W x 3" D x 4" H (14 x 9 x 12 cm)
External Dimensions: 7" W x 5" D x 6" H (19 x 13 x 16 cm)
Weight: 11.2 oz (318 g)

Zoom 3
Designed for digital SLR cameras like Canon's Digital Rebel with a lens up to 3""

Additional Features:
A full-coverage top
Easy Squeeze buckle for quick access with a zipper for back-up security and weather protection
Windowpane-Mesh pocket organizes other small accessories.
Internal Dimensions: 6 W x 3" D x 6 H (15 x 10 x 15 cm)
External Dimensions: 7" W x 5" D x 8 H (19 x 14 x 20 cm)
Weight: 15 oz. (416g)

Zoom 4
Ideal for Canon's Digital Rebel, EOS and Nikon's D70 with the 18-70mm lens attached
Designed for digital SLR cameras with a lens attached up to 4"

Additional Features :
Windowpane-Mesh pocket organizes other small accessories
Two zippered side pockets hold additional accessories such as a cell phone or PC card
Internal Dimensions: 6 W x 4" D x 7 H (15 x 11 x 18 cm)
External Dimensions: 8 W x 5" D x 8" H (20 x 14 x 22 cm)
Weight: 1 lb. 1oz. (490g)