Abstract: A structural assembly is provided with a rectangular, hollow flame including a loop flange along edges, a recess on one side of the flange, a channel through the recess, a wall facing and spaced from one end of the channel within the frame, and a groove through the wall; and a flexible sealing cap complimentary to the recess and including an outer handle, an inner engaging member spaced from the handle, an L-shaped peg on one surface of the engaging member distal the handle, and an enlargement at one end of the peg. The enlargement is larger than the peg. Width of the groove is greater than the peg. The enlargement is larger than the width of the groove. The peg and the enlargement can pass the channel. A periphery of the engaging member is greater than that of a bottom of the recess.

Abstract: A waterproof, shockproof container for a handheld electronic device is provided with a rectangular base including a top loop flange disposed along and spaced from edges, a loop gap between the flange and the edges of the base, four bottom L-shaped depressions at four corners of the base respectively, and threaded holes spaced along the gap wherein four of the threaded holes are through the depressions respectively; a rectangular waterproof loop member fitted in the loop gap and including bossed holes spaced along edges, and four L-shaped collision resistant members at four corners of the waterproof loop member respectively; a rectangular, hollow frame including a loop flange disposed along edges, and bossed threaded holes spaced along an inner surface of the flange; and a rectangular, hollow bumper member. The base, the frame, and the bumper member are releasably secured together.