I bought some 5wt Green Mountain line at Wal-Mart. After putting it on my fly reel, I thought there is no way that this is 5wt line, maybe a 8 or even 9wt! I took it off my reel and took it back to Wal-Mart and compared its diameter to another box of 5wt line and the stock person agreed that it was not the same and I exchanged it..............

But the line casts great! For $18 it was a steal! A very nice line, just make sure it isn't mis-marked with the wrong weight.