May many types available, but for those whom want to benefit from ipod wilderness on the tight budget, I would recommend the military ALICE packet.
Some sort of Airsoft rifle forum should possess a muzzle velocity of nearly 400fps. http://Kiesey-Calding.com/__media__/js/netsoltrademark.php?d=186.31.27.77%3A8002%2FActivityFeed%2FMyProfile%2Ftabid%2F56%2FuserId%2F299735%2FDefault.aspx