The outside of the store appears to be made of metal. It is also a very small store that has a large sign that reads its name written in red text on the top.
The inside of Grab-it Mart resembles any quick-stop store, having items such as food.
Role in episode
Grab-it Mart is first seen when the purple cellmate explains how chum is useful to Plankton. The purple cellmate then puts chum on his face, walks into the Grab-it Mart, and scares the cashier into handing him all of the money in the cash register.