The storage bags must be kept for a

The storage bags must be kept for a couple of bags always.

Results (Chinese) 1:

存储袋必须始终保持了好几袋。

Results (Chinese) 2:

储物袋必须保持的一对夫妇的包包始终。

Results (Chinese) 3:

储藏袋必须放在一对夫妇的袋子里。