Water NOT included 5 gallon water storage containers, 4pack (approx 20 gallons total). Portable Stackable Food-grade plastic. Included caps (1 per container, 6 total) have gaskets and 3/4 NPT knockouts for use with the included spigot (qty 1 spigot per kit). If desired, carefully remove the membrane in the center of one of the caps and install the spigot. Once the content of the first container are depleted, this cap can be moved on to the next. These are industrial grade containers used in a variety of applications. The lids are to be tightened firmly. A wrench (one included) or similar tool is typically required to snug and loosen the cap. Stackable three to four high per the manufacturer but we advise two or three high subject to your good judgement and safety considerations. The vent cap can be removed and the nipple pierced to improve flow in dispensing. The side walls may not be flat. While generally rectangular, some amount of curvature of the side walls is common. This may be noticeable if using your Samson Stackers on their sides as with a spigot, Refer to FEMA advise on container preparation for water storage applications. New product arrives clean and in a box. There are no “BPA free” markings on the container as BPA is not used in HDPE containers. Shipping Included in the Price. Actual outbound and return shipping expenditures are not available for refund. All orders boxed for shipping.