There has been some discussion about the original Triumph soft luggage. Here is my experience: I bought the original 20l bags with the vehicle (important, more in a moment). The bags were later supplied with a set of waterproof inner liners as the outer liners supplied with the bags did not stop water from entering the bags. The zippers are flimsy and one broke after my fourth or fifth trip with the bags. The bags were recently replaced as part of the extended four-year warranty with the new 25l bags that have a zipped-in inner liner. They look a little more solid to me but I yet have to try them out.
Here is the important part: If you bought your Rocket with the bags fitted at the time of purchase, the bags are covered under the same warranty as the bike itself: 2 years plus 2 years of extended warranty. If, however, you bought the bags separately, they come with the warranty of an accessory, which is just *one* year (at least here in Europe). I was lucky to get a set of new and improved bags almost for free (a service fee of 50€ applies for the second half of the four year warranty).