The invention discloses a double-specification general case. The double-specification general case comprises a shell and an upper cover, wherein a first top cover or a second top cover is arranged selectively on the shell, the first top cover has a first thickness, the second top cover has a second thickness larger than the first thickness, and the upper cover comprises a covering part and a connection part. The covering part can be arranged on the shell in a sliding mode and has a covering part thickness, the connection part extends to the covering part and has a connection part thickness smaller than the covering part thickness, in this way, the connection part can slide into the space below the first top cover, a gap is formed between the connection part and the lower surface of the first top cover, or the connection part can slide into the space below the second top cover and is connected to the lower surface of the second top cover.