The BLUBB is made of durable nylon pack cloth and each section is individually hot-cut to sear the edges; this prevents raveling. As nylon can be rather noisy and slippery, the surface that the lens is placed on has a layer of heavy duty cotton duck fabric sewn on top of the nylon fabric. The entire upper surface of the BLUBB is concave so that the lens will stay put. The inner surfaces that are placed over the door-frame or car window have a large piece of Toughtek non-slip fabric sewn in place to help keep the bag from slipping, especially in vehicles where the driver's window angles downward to the right. All of the fabrics have a water-repellent (but not water-proof) finish. The entire bag is sewn with nylon thread used in the parachute industry. The bag closes with a top quality YKK nylon zipper. All seams are sewn twice to help prevent failure. The bags are made in the USA and each is individually hand-sewn to extremely high standards.
The bag is large (roughly 12X10X6") so that your lens will be totally steady. My bag, the final prototype, weighs almost exactly 16 lbs. after being filled with nearly four complete 4 lb. bags of Goya Pinto Beans purchased at Wal-Mart. For flight or action photography from your vehicle combining the BLUBB with a Panning Ground Pod is an amazing combination. All BLUBB purchases will include a detailed instructional file explaining exactly how to use and get the most out of your BLUBB.
We recommend filling with Plastic granules. You need for filling ca. 5- 6 kg.