Watertight bag

Abstract

A watertight bag includes a bag body, a closure retainer and a fastener. The bag body has an opening facing upward at a top edge thereof. The top edge of the bag body is to be folded over to turn the opening upside-down. The closure retainer is disposed at the top edge of the bag body and includes first and second strip members that are respectively disposed at opposite sides of the bag body for sealing the opening of the bag body. The fastener is disposed on the bag body for fastening the closure retainer in position when the top edge of the bag body with the closure retainer thereon is folded over and turn the opening of the bag body upside-down.

The invention claimed is: 
     
         1 . A watertight bag, comprising:
 a bag body formed by connecting first and second flexible sheets with an opening in a top edge thereof, the first and second flexible sheets having opposite upper edges which together serve as the top edge of the bag body, wherein the upper edge of the first flexible sheet has an inner planar surface essentially attached evenly to that of the upper edge of the second flexible sheet to close the opening of the bag body, and the top edge of the bag body is to be folded over to turn the opening of the bag body upside-down;   a closure retainer disposed at the top edge of the bag body to retain the upper edges of the first and second flexible sheets abutting evenly against each other so as to retaining the closing of the opening of the bag body, wherein the closure retainer includes a first strip member attached to an outer planar surface of the upper edge of the first flexible sheet, and a second strip member attached to an outer planar surface of the upper edge of the second flexible sheet; and   a fastener disposed on the bag body for fastening the closure retainer in position when the top edge of the bag body together with the closure retainer thereon is folded over and turn the closed opening of the bag body upside-down,   wherein the first strip member includes a first retaining body and a first engaging portion, the first retaining body has a lower planar portion attached to the outer planar surface of the upper edge of the first flexible sheet, and an upper planar portion extending upward and outside the upper edge of the first flexible sheet, and the first engaging portion is disposed on the upper planar portion of the first retaining body;   wherein the second strip member includes a second retaining body and a second engaging portion, the second retaining body has a lower planar portion attached to the outer planar surface of the upper edge of the second flexible sheet, and an upper planar portion extending upward and outside the upper edge of the second flexible sheet, and the second engaging portion is disposed on the upper planar portion of the second retaining body to be engaged with the first engaging portion of the first strip member; and   wherein when the first and second engaging portions are engaged, the upper edges of the first and second flexible sheets of the bag body are pressed evenly against each other and tightly sandwiched by the lower planar portions of the first and second retaining bodies of the first and second strip members so as to ensuring the closing of the opening of the bag body.   
     
     
         2 . The watertight bag as recited in  claim 1 , wherein the first engaging portion of the first strip member and the second engaging portion of the second strip member are together configured to form an interlocking rib and groove closure. 
     
     
         3 . The watertight bag as recited in  claim 2 , wherein the first engaging portion of the first strip member is directed to a rib, and the second engaging portion of the second strip member has a base slightly protruding toward the first engaging portion, and a groove defined at least in the base to receive the first engaging portion so that when the first and second engaging portions are engaged to form the interlocking rib and groove closure, a clearance is formed in between the lower planar portions of the first and second strip members for accommodation of the top edge of the bag body. 
     
     
         4 . The watertight bag as recited in  claim 1 , wherein each of the first and second strip members includes a lip portion extending upward and outward therefrom so that a clearance is defined between the lip portions when the first engaging portion of the first strip member is engaged with the second engaging portion of the second strip member. 
     
     
         5 . The watertight bag as recited in  claim 4 , wherein the lip portions of the first and second strip members are formed with a plurality of ribs on opposite inner sides thereof. 
     
     
         6 . The watertight bag as recited in  claim 1 , wherein the first and second flexible sheets of the bag body comprise a material of thermoplastic polyurethane. 
     
     
         7 . The watertight bag as recited in  claim 1 , further comprising a pair of lugs respectively disposed at opposite side edges of the bag body for coupling to an external device. 
     
     
         8 . The watertight bag as recited in  claim 1 , wherein the bag body is formed with a fold line about which the top edge of the bag body with the closure retainer thereon is folded over to a position where the closure retainer is ready to be fastened by the fastener. 
     
     
         9 . The watertight bag as recited in  claim 8 , wherein the first strip member includes a jutting section extending downward from a bottom thereof, and the jutting section has a bottom edge that is tapered in thickness toward an inner side thereof and joined to the fold line. 
     
     
         10 . The watertight bag as recited in  claim 1 , wherein the fastener is attached to a front side surface of the bag body and located at on the same side of the bag body with the first flexible sheet, and the fastener and the first flexible sheet are configured to together form an interlocking rib and groove closure therebetween in order to fasten the closure retainer when the top edge of the bag body together with the closure retainer thereon is folded over and turn the opening of the bag body upside-down. 
     
     
         11 . The watertight bag as recited in  claim 10 , wherein the first strip member defines a locking groove in an outer surface thereof, and the fastener is formed with a ridge to be engaged in the locking groove of the first strip member. 
     
     
         12 . The watertight bag as recited in  claim 11 , wherein the second strip member is formed at opposite ends thereof with a pair of projections, the fastener further has a pair of folding sections at opposite ends thereof and laterally extending outside the bag body, and each of the folding sections of the fastener defines an engaging hole for reception of a respective one of the projections of the second strip member when the folding sections are folded over back to the bag body.