Here is a list of the required materials to make a 15x15x15 net

Ropes- (it is best to use Static rope because it will stretch less when under wight)

outer rope- 50ft of PMI E-Z Bend 11mm static rope. (found at REI) inner support rope- PMI 6mm accessory cord (found at REI sold in 52ft package so you need 2) netting- i used 550 type 3 para cord. (i purchased a 1,000ft spool on amazon. this will be more than enough for a 15x15x15 net)

Rigging- ( here you can use many different methods but useing 3 ratchet straps works well)

Ratchet straps x3 carabiner's x3

(the reason for using ratchet straps is to remove the sag that naturally couscous when it's under weight. if you are like me and have some climbing gear you could use GRIGRI'S, pulleys, slings, and carabiner's. I like using some climbing gear set the net really high in the air)

Other Materials- ( some other things you will need)

Knife/scissors lighter hammer screw driver hacksaw/sawzall (for the ratchet straps) pliers good set of trees (you can use cheep rope from home depot but your net will stretch)

(you can use cheep rope from home depot but your net will stretch)