Explorer 1
Ideal for carrying and protecting a digital or film SLR (like Canon's 20D or Nikon's D70s) with a lens attached, an additional lens and accessories

Internal Dimensions: 8W x 4"D x 6"H (20 x 11 x 16 cm)
External Dimensions: 9W x 6"D x 8"H (23 x 17 x 22 cm)
Weight: 1 lb. 2.3 oz. (519 g)

Explorer 2
Ideal for carrying most digital or film SLRs (like Canon's 20D) with a grip and zoom lens attached, several additional lenses, a flash and accessories

Internal Dimensions: 8"W x 5D x 7"H (21 x 13 x 20 cm)
External Dimensions: 9"W x 7"D x 9H (24 x 18 x 23 cm)
Weight: 1 lb. 6.3 oz. (632 g)

Explorer 10
Ideal shoulder bag for a compact digital or film SLR (like Canon's Digital Rebel XT or Nikon's D50) with a small lens attached

Internal Dimensions: 6W x 3"D x 6H (15 x 9 x 15 cm)
External Dimensions: 7"W x 6"D x 8"H (20 x 16 x 21 cm)
Weight: 14.8 oz. (420 g)