Need Help for 2015 Outlander 1000XT-Rear seat

Hey All, so i have a 2015 Outlander 1000XT, which i love. I normally just go riding with me and the guys but sometimes i want to bring my GF as a passenger. There are a lot of options for a rear seat cargo box. I just wanted to get everyone’s feed back on what they use and what they feel works the best.

Please let me know it would be greatly appreciated.