Package

1. A package formed from a flexible sheet material, the package comprising:

a first side and a second side; and

a hinge that foldably connects the first side and the second side to each other,

wherein the first side and the second side transition between a closed state and an opened state by pivoting around the hinge,

wherein, in the closed state, a space for accommodating an article being provided, in the opened state, the space being opened,

wherein the first side includes:

a first fitting portion in any one of a projecting shape and a recessed shape,

a rigid portion provided in a partial section on a line that goes around the first fitting portion, and

a first weak portion provided in a remaining section on the line that goes around the first fitting portion and being lower in rigidity than the rigid portion, and

wherein the second side includes:

a second fitting portion in an other of the projecting shape and the recessed shape and thus configured to be fitted to the first fitting portion in the closed state, and

a second weak portion provided on a line that goes around the second fitting portion and being lower in rigidity than the rigid portion.

2. The package according to claim 1 , wherein

the first side further includes a peripheral portion that forms a periphery of the sheet material at a position distant in a direction of radius from a pivot center of the first side and the second side in the hinge,

the first fitting portion is provided at a position adjacent to the peripheral portion, and

a length from the peripheral portion to the first weak portion is longer than a length from the peripheral portion to the rigid portion.

3. The package according to claim 1 , wherein

the first weak portion is provided by continuously cutting the first side along the line that goes around the first fitting portion.

4. The package according to claim 1 , wherein

the second weak portion is provided as a perforated portion provided by intermittently cutting the second side along the line that goes around the second fitting portion.

5. The package according to claim 4 , wherein

the perforated portion includes a cut portion where the second side is cut and a non-cut portion where the second side is not cut, and

in the closed state, the non-cut portion is arranged as being superimposed on an area from the first fitting portion to the first weak portion on a surface of the first side.

6. The package according to claim 1 , wherein

the first side is provided with a depression in a depressed shape in conformity with a shape of the article,

the first fitting portion is in the projecting shape when viewed from the second side in the closed state, and

the second fitting portion is in the recessed shape when viewed from the first side in the closed state.

7. The package according to claim 1 , wherein

the first side further includes a third fitting portion provided at a position distant from the first fitting portion, and

the second side further includes a fourth fitting portion provided at a position distant from the second fitting portion and fitted to the third fitting portion in the closed state.