What is the best long dog leash to use when playing with my Akitas outside?

I want to buy a long dog leash so I can play fetch with my Akitas when I go to the park. What is a good quality long dog leas?

Get a lunge line that is used for horses. You can modify the ends & it is a good length.http://images.search.yahoo.com/search/images?_adv_prop=image&va=lunge+line

http://www.amazon.com/Remington-Check-Training-Leash-Yellow/dp/B000HTPIQU/ref=sr_1_fkmr2_1?ie=UTF8&qid=1340566510&sr=8-1-fkmr2&keywords=braided+poly+leash+50+feetAbove is the one I use for my dogs,I love it,I used it mostly for working on there recall but I use it now for letting them get the chance to wander on hikes in the hills.Its very durable.You can find it at Petsmart or Petco.

noneno dog should be off leash in public without proper training