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(Yes there is.)
(Not any more! ha HA! Oh... drat)
box, to answer your question: settee. hee hee hee!
It's cool. It's a multipurpose shape: a box.
While not necessarily having corners, a box is meant to contain something, even if just for storage for brief transportation.
"Fish, and plankton, and sea greens, and protein from the sea. It's all here, ready. Fresh as harvest day."