A cellular confinement system comprising: (a) a first unitary web of cells made from elongated plastic strips bonded together in spaced apart areas; the strips forming walls of the cells; at least some of the cells defining open slots; and (b) a second unitary web of cells made from elongated plastic strips bonded together in spaced apart areas; the strips forming walls of the cells; at least some of the cells defining open slots; (i) at least one open slot of the first unitary web of cells being aligned with at least one open slot of the second unitary web of cells to result in a cell overlap region; the cell overlap region having opposite first and second sides; characterized by (c) at least one connection device fastening the first unitary web of cells and the second unitary web of cells together; the connection device including: (i) an insertion member having first and second opposite insertion ends and an insertion member extension therebetween; the insertion member having a first length between the first and second insertion ends; the insertion member being located on the first side of the cell overlap region; (ii) an integral shank extending generally perpendicular from the insertion member extension and being spaced from each of the first and second insertion ends; the shank extending through the cell overlap region by extending through both of the aligned one open slot of the first unitary web of cells and the one open slot of the second unitary web of cells; (iii) an integral handle member extending generally perpendicular from the shank at an end of the shank remote from the insertion member; the handle member having first and second handle ends and a handle member extension therebetween; the shank being spaced from each of the first and second handle ends; and the handle member being located on the second side of the cell overlap region. (a) a first unitary web of cells made from elongated plastic strips bonded together in spaced apart areas; the strips forming walls of the cells; at least some of the cells defining open slots; and (b) a second unitary web of cells made from elongated plastic strips bonded together in spaced apart areas; the strips forming walls of the cells; at least some of the cells defining open slots; (i) at least one open slot of the first unitary web of cells being aligned with at least one open slot of the second unitary web of cells to result in a cell overlap region; the cell overlap region having opposite first and second sides; characterized by (i) at least one open slot of the first unitary web of cells being aligned with at least one open slot of the second unitary web of cells to result in a cell overlap region; the cell overlap region having opposite first and second sides; (c) at least one connection device fastening the first unitary web of cells and the second unitary web of cells together; the connection device including: (i) an insertion member having first and second opposite insertion ends and an insertion member extension therebetween; the insertion member having a first length between the first and second insertion ends; the insertion member being located on the first side of the cell overlap region; (ii) an integral shank extending generally perpendicular from the insertion member extension and being spaced from each of the first and second insertion ends; the shank extending through the cell overlap region by extending through both of the aligned one open slot of the first unitary web of cells and the one open slot of the second unitary web of cells; (iii) an integral handle member extending generally perpendicular from the shank at an end of the shank remote from the insertion member; the handle member having first and second handle ends and a handle member extension therebetween; the shank being spaced from each of the first and second handle ends; and the handle member being located on the second side of the cell overlap region. (i) an insertion member having first and second opposite insertion ends and an insertion member extension therebetween; the insertion member having a first length between the first and second insertion ends; the insertion member being located on the first side of the cell overlap region; the insertion member being located on the first side of the cell overlap region; (ii) an integral shank extending generally perpendicular from the insertion member extension and being spaced from each of the first and second insertion ends; the shank extending through the cell overlap region by extending through both of the aligned one open slot of the first unitary web of cells and the one open slot of the second unitary web of cells; the shank extending through the cell overlap region by extending through both of the aligned one open slot of the first unitary web of cells and the one open slot of the second unitary web of cells; (iii) an integral handle member extending generally perpendicular from the shank at an end of the shank remote from the insertion member; the handle member having first and second handle ends and a handle member extension therebetween; the shank being spaced from each of the first and second handle ends; and the handle member being located on the second side of the cell overlap region. the handle member being located on the second side of the cell overlap region.