Let me tell you one thing! If you know quality motorcycle bags, you know Givi. The GIVI Weatherproof WP400 Roll Bag is an expedition quality bag and seals like a water tight kayak bag. Are you not already into it?
It seems you never have enough space on a motorcycle but this bag is well designed and roomy. Going on a day trip? OK! Going to hit the roads for a couple of days? OK! You could put all your clothes in this bag and it is very easy to tie down so just detach it anytime you want with so much ease. As a special addition the WP400 have all the required reflective spots which are very bright too. To be honest the material feels a little lighter than I anticipated but it is very tough and that makes the bag as light as it is possible. The GIVI WP400 Measures about 12 inches X 18 inch X 12 inch tall when sealed. Very high quality bag, highly recommended!