Nite Ize Rugged Optics Case Carabiner loop allows you to clip anywhere to keep your glasses conveniently accessible Features a sewn-in 2.5" x 12" micro-fiber, non-scratch lens cleaning cloth (2.5" x 12.5") External Case Dimensions - Medium: 6.65" x 2.97" x 2.44" (169.03mm x 75.50mm x 62.00mm); Large: 7.10" x 3.42" x 2.68" (180.38mm x 86.89mm x 68.17mm) Internal Case Dimensions - Medium: 2.25" x 6.1" x 1.83" (164mm x 62mm x 44mm); Large: 6.9" x 3" x 1.9" (176mm x 77mm x 47mm) Weight - Medium: 2.86oz (81.00g); Large: 3.39oz (96.00g)