A container 100 includes a cover 102 and a base 104. The container cover 102 includes a first closure portion, an engagement portion 208, and an alignment portion. The base 104 includes a second closure portion. The first closure portion of the cover 104 is sealingly engageable with the second closure portion of the base 104 to define a sealed storage area. The covers 102 stack together in two different ways. First, the covers 102 can be stacked into an “aligned” stack. Second, the covers 102 can be stacked into a releasably locked stack. The alignment portion of the cover 102 is engageable with the alignment portion of a second cover 602 to form an aligned cover stack. The engagement portion 208 of the cover 102 includes one or more engagement lugs 424 that are engageable with corresponding engagement lugs 624 of the engagement portion 608 of a second cover 602 to form a releasably locked cover stack 750. The engagement portion 208 of the cover 102 further includes one or more drainage channels 444 that provide a passageway for liquid entrapped between locked covers to quickly drain or evaporate.