The present invention includes a blank and container formed of cellulose-based materials configured to form a triangular shaped container. The container includes a triangular shaped bottom panel, side walls and a rear wall that define a first triangular volume. The top panel and second side panels generally form a second triangular volume that is slightly larger than the first triangular volume. The second triangular volume is configured to fold over the first triangular volume such that the top panel and second side panels fully enclose the bottom panel and the first side panels. The container is locked by a friction fit between juxtaposed tabs inserted into a slot located between the ends of the intersecting first side panels.