Have the RV Superbag, and it works well. Lots of choices on colors, if that matters. Overall, I'm happy with the product.
The RV Superbag is rather pricey, and I might have gone with Travasak if they were operating when I was buying. I believe they were a casualty of the recession, but it's been reported here that Travasak is again available through Camping World. Not sure if they just bought the name or whether the original company is involved any more. I haven't seen any reports on whether the new product is comparable to the old. The original Travasaks received good marks here as I recall it.