For less than $20 more, you can get the DXP bag which has ~22 liters of space (versus ~16 for the EXP). Looking at the pics, they look almost the exact same; but almost 30% more space is really nice. I have the DXP, and think it's the perfect size bag/pannier for commuting and quick around-town trips. And yes, you need the MTX Explorer rack.
Originally Posted by
downwinded
I really like mine for commuting and light shopping trips. The explorer rack works fine for me. Don't know what you want to carry for overnight trips. I would not expect the fold down panniers to hold up to being crammed full to the point of having to force the zippers to close. I really like the mtx system and rack. If I were planning on using the rack for something besides one of the mtx bags, such as a full sized pannier, I would recommend the tourist version.
x2. The Tourist rack has sidebars mounted lower so that you can use an MTX slide-in trunk bag and full-size clipon panniers from anyone else. If you think you'll ever want to use the MTX bag as a trunk bag and bigger standalone panniers, go ahead and grab the Tourist rack.