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The ability to store resource items anywhere in the workspace and move them around can be critical for coordinating task and group interactions on a table. However, existing casual storage techniques for digital workspaces only provide access to stored items at the periphery of the workspace, potentially compromising collaborative interactions at a digital tabletop display. To facilitate this storage behavior in a digital tabletop workspace, we developed the storage bin mobile storage mechanism, which combines the space-preserving features of existing peripheral storage mechanisms with the capability to relocate stored items in the workspace. A user study explores the utility of storage bins on tabletop display collaboration.