You are going to adjust your hammock in outside, but you need strap which is strong and long enough. You can use Eno hammock strap to overcome your problem. This strap is design for trees and it is a suitable for you who have big capacity to restrain your load. This strap is made from 100% polyester which it will not stretch easily. Therefore, it is suitable for any sizes of hammock. So, you will get the advantage by using this strap. It has 270 cm long and it can restrain weight until 330lbs. In addition, this strap is durable. You can keep it while you do not need to use it.