The best in my opinion is the Tornado Pac-Vac System, They come in 6 & 10 quart sizes. I can say from personal experience that they work great, use disposable bags and are constructed well. I got mine at Facility Solutions Group the website is facilitysi .com. Can't post links yet sorry. Best price around and the staff is very knowledgeable about their products. The harness on the Pac-Vac is made by Deuter, the company that makes legit hiking packs and gear harnesses. If your still looking, Check them out for sure.