The video shows the 2’x 2′ fishing live bait pen and how it expands for use and collapses for storage. You also get a good idea of the toughness of the netting and simplicity of it’s construction. The 4’x 2′ and 4’x 4’x 2′ fishing live bait pen works in the same way except it has 2 uprights on either side of the door instead of the single, centrally located, upright shown in the 2’x 2′ pen video.