I carry 13:
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Someday (when the disc buying sensation wanes - and i get good at DG) i would like to be the guy that shows up to the course with 3 discs and whips everyone.
I'm a firm believer that all you need are four discs; putter, mid-range, over and understable driver.
I am living proof that all you really need is one disc. You CAN learn to make all your shots with a single disc.
Most of the summer my one disc was a Champ Eagle, but I switched to a DX Cheetah a week ago.