The rigid construction includes an ABS body lower cap and lid o-ring seal and neoprene lining. The twist off ribbed lid contains finger grooves as well as a cross bridge configuration. The case can be closed two ways - Mid-Seal or Max-Seal. Mid-Seal means the case lid will not come off or undone but an air and water tight seal has not been achieved. Max-Seal means the lid is fully closed and a water and air proof seal has been achieved. The lid will be completely closed. The case includes two silica gel packs two split rings for optional strap attachment and a 77mm Fitting Disk that can be added to the lower portion of the case to provide a tighter fit. A small bungee strap is included that wraps around the case to help you carry it. Two split rings are included that are used to attach a larger optional shoulder strap. Dimensions: 3.7 x 4.4 x 3.7" (9.4 x 11.2 x 9.4cm) (WHD). Material: Shell: 3.5" (8.9cm) ABS plastic 0.2" (6mm) thick. Lower Cap/Lid: Injection molded ABS plastic. O-ring Lining: 2mm neoprene. Case Bottom/Underside of Lid: 1.5" (3.8cm) thick polyurethane. Fits Lenses 1.2 to 2.7". Fits Lens with Maximum Diameter of 73mm. Waterproof to 39.4" for 10 Minutes. Rigid ABS Construction / Crush Proof. Interior Memory Foam System. Twist Open Design / Finger Grooves. Ribbed Lid. Includes Bungee Strap for Portability. Made in the USA.