Feed Bag, Rectangular (They are custom-sewn, but we keep this size in stock.) These are the horse trailer feed bags that commonly come with brand new side-by-side horse trailers, and they are the BEST YOU CAN BUY. They are constructed with 14 oz. heavy vinyl, each seam is double-sewn & reinforced with heavy-duty webbing binding & each features spurred brass grommets. Measures 30" X 24" X 12" deep. (30" across the chest of the horse). 108" total measurement.These are the feed bags that are fastened in front of a in-line, side-by-side or two horse straight-load trailer with no built-in feed manger. They fasten with double-sided snaps to D-rings on your trailer (not included). These are the most durable feed bags on the market today. If you need a different size, custom-sewn rectangular (or square) feed bags are available, for the same price, by the SKU: FBRC. 4 1/2" double-end snaps are sold separately on this page. You may need to install D-Rings in your trailer. D-Rings are sold on the D-Ring page.