Waterproof bag

A waterproof bag, comprising:

• a main body portion, made of waterproof material, and comprising a front side portion and a rear side portion, and having an accommodating cavity;
• wherein the front side portion and the rear side portion are connected to each other;
• the accommodating cavity is located between the front side portion and the rear side portion and has an opening;
• the opening is located between the front side portion and the rear side portion;
• the rear side portion extends beyond the front side portion in the height direction of the main body portion and is configured to be foldable at least twice so as to switch the waterproof bag between an unfolded state, a first folded state, and a second folded state;
• the rear side portion comprises a first folding portion and a second folding portion;
• the first folding portion extends beyond the front side portion in the height direction of the main body portion;
• the second folding portion is located below the first folding portion;
• the front side portion comprises a first corresponding portion and a second corresponding portion;
• wherein the first corresponding portion is opposite to the second folding portion;
• the second corresponding portion is located below the first corresponding portion;
• and
• a fastening assembly, comprising a first fastening structure pair and a second fastening structure pair;
• wherein the first fastening structure pair comprises a first fastening element and a first mating element;
• the second fastening structure pair comprises a second fastening element and a second mating element;
• wherein the first fastening element and the second fastening element are disposed on the first folding portion;
• the second mating element is disposed on the main body portion;
• wherein the first fastening element comprises a first magnetic attraction element, the first mating element comprises a second magnetic attraction element, the first mating element is disposed on the second folding portion;
• when the waterproof bag is in the unfolded state, an upper edge of the rear side portion is higher than an upper edge of the front side portion in the height direction of the main body portion;
• when the waterproof bag is in the first folded state, the first folding portion is folded downward to oppose the first corresponding portion, and the first fastening element couples with the first mating element to close the opening by a magnetic attracting force between the first magnetic attraction element disposed on the first folding portion and the second magnetic attraction element disposed on the second folding portion, wherein the first folding portion and the second folding portion of the rear side portion are located at two opposite sides of the first corresponding portion of the front side portion;
• when the waterproof bag is in the second folded state, the first folding portion, the first corresponding portion, and the second folding portion are folded downward to oppose the second corresponding portion;
• and the second fastening element couples with the second mating element.