I'm getting these links from Amazon, but you can find these bags at most any military surplus store/website.
Here's a bag style a few of my buddies use for their float tubes:
Amazon.com : Official US Military Army Navy Surplus Duffle Duffel Bag : Sports Duffel Bags : Sports & Outdoors
This tyle will hold an Outcast Fishcat 4 Deluxe plus fins.
I'm currently using this style of bag, as I like to put my fins, waders, etc. in the bag with my tube.
Amazon.com: Deluxe Duffel Bag w/Zipper, Olive Green - 36"X13"X13": Sports & Outdoors
What I like about these bags is that they are very durable and inexpensive. You can fill them with a hundred pounds of gear and literally drag them over any surface for a hundred yards and the heavy canvas will stand up to it. It'll show some scuffing and that's it. And your gear will be safe inside. Also, many times when I'm packing up to head home, my tube, waders, boots, etc., are still wet from the lake, or even muddy. These bags are thick enough to absorb most of the water, and keep the mud off the upholstery. Then when I get home, I just use a garden hose to rinse all that gunk out of it.
They aren't sexy; they don't cost enough for that, but they are pretty good at hauling large awkward bundles to and from the truck.
Peace.
