I've had great luck with the Alaskan game bags. They are very durable and reusable and won't break the bank. I've taken the necks of the bags and tied them around a limb on many occasions and they bag easily held a 100lbs of meat. A package with the four in them would do you good for an elk.
I used these last year. Seemed very durable, breathed very nice, and washed up like new.