Plastic package with an open reminder

A plastic package (100) with an open reminder, comprising:

• a container (1) and a cover (2);
• the container (1) comprising a containing space (10) therein, a step portion (11) formed around an inner wall thereof, a horizontal extending surface (12) formed around an outer edge of the step portion (11), an outer folding portion (13) formed around an outer edge of the horizontal extending surface (12) and extending downward therefrom, and a protruding portion (14) formed between the horizontal extending surface (12) and the outer folding portion (13), the protruding portion (14) being disposed at a position higher than the horizontal extending surface (12);
• the cover (2) comprising a concave portion (21) formed therearound and corresponding to the step portion (11) for securing the cover (2) in place when the cover (2) is sealed, a horizontal covering body (22) extending from an outer edge of the concave portion (21), contacting to an inner wall of the protruding portion (14), and covering on the horizontal extending surface (12);
• the horizontal covering body (22) having at least a tab (23) sticking out from a corner of the horizontal extending surface (12);
• the tab (23) comprising a perforated line (231) and a pulling piece (232), the perforated line (231) extending from a point near the tab (23) to another point far away therefrom and arranged along an edge of the pulling portion;
• when the plastic package (100) is sealed, the container (1) is covered by the cover (2), and the concave portion (21) is embedded into the step portion (11) for combining together;
• when opening the cover (2), holding and pulling up the tab (23) is needed to tear off the pulling piece (232) along the perforated line (231), followed by horizontal covering body (22), thereby opening the cover (2).