So I wanted to get a water proof bag to put my camping stuff in and came up with this solution. I got the bag and the straps at REI for a total of $65.00 dollars. In the bag I have a two man tent, two sleep pads, sleeping bag, pillow and stove with cooking pot. The bag is 55L. I hope this might be helpful for someone else looking for some similar without costing $250.00.
Bag:
http://www.rei.com/product/784155/sealline-black-canyon-dry-bag-55-liters
Straps:
http://www.rei.com/product/848429/redpoint-34-webbing-straps-with-side-release-buckles-package-of-2
Bag:
http://www.rei.com/product/784155/sealline-black-canyon-dry-bag-55-liters
Straps:
http://www.rei.com/product/848429/redpoint-34-webbing-straps-with-side-release-buckles-package-of-2