I like to relax in my truck at the weekends. To start my little grill I used a 1 pound disposable. propane cylinders. At around $3.50 each, it can get expensive pretty quickly. So I bought £20 left over. Propane tank and used a hose adapter to connect it to my grill. Yes, the 20-pound tank worked great and was cheap to fill up, but it was too big and heavy to carry around. Also, it kept flipping and rolling in the back of my truck. So I bit the bullet and bought this 1 gallon propane tank. It's the perfect size for camping. It's very easy to lift at only 11 pounds (on full propane). It has a wide rim at the bottom to keep the tip from tipping over. And that equates to just over 4 unique 1 pounds. propane cylinders. I also use it often with my small 700w propane inverter generator. It will work with the generator for about 8 hours at full load. Check out the photos I took to see how it compares to the standard 20lb. propane tank. -Steve