1.) Real 5+gallon tank 2.) No fume leaks 3.) Long \"nose\" make it easy to fill 4.) Doesn't expand at all, thinner than plastic tank 5.) Easy to fill up because it doesn't have filter I have tried everything Walmart carries. Nothing worked for me. This metal tank works flawlessly. No more designed or made in US plastic tanks. All leaks/difficult to fill up/drain. I m super happy with this product. It's a bit heavy but it passed all aspects of a good fuel tank.