Hello, I just recently purchased a new bike and am planning on commuting to work on it quite often and also using it to get groceries and such items.

My bike (Raleigh Clubman Alloy - 2017) comes with full fenders with a place to attach a rear rack. I have always wanted to try a rear rack and not having a full backpack and getting a really sweaty back in the summer. I just have a question on what a good set-up will be. I do get discounts on a couple of brands (I'm an outdoor industry professional and that's relatively common) so I'm really only focusing on a couple of brands that I get discounts for (sorry, not trying to rub it in just trying to give a more complete picture to make an informed decision).

I was thinking about Topeak's Explorer MTX (Disc Model) Rack with Spring (my bike has disc brakes). https://www.todsonb2b.com/products/t...iant=907200315

That rack I think would be a good fit for me. The place I'm having trouble deciding, is to go with Topeak's compatible bag - the MTX Trunk bag with foldable panniers that locks into that rear rack - https://www.todsonb2b.com/collection...panels-tt9635b

The other option would be going with a more traditional pannier like the Ortlieb Back Roller Classic Pair (or the Back Roller Plus - pair).

I've never used panniers or a rear rack before so I'm not sure exactly what I'm looking for. Just that I need to bring a decent amount of gear with me when I commute to work (outdoor professional again) and would like to make grocery/farmers market runs as well. I've heard good things about both of these bags, just not sure what would be better suited for my interests.

Is there a way to know if that rear rack will fit my bike well? I found no information on Raleigh's website about compatibility with different racks. And from Topeak I saw that the rack I picked out fits 700c wheels and bikes with disc brakes which makes me think I'm covered. Are there any other fit considerations to be concerned about? I was reading about people hitting their panniers with their feet while peddling because the bag was large. Thanks for all of your help!

Here's a link to the bike I purchased in case that helps:
https://www.raleighusa.com/clubman-alloy-1563

And if it matters the length of my commute is 16.5 miles one-way but hopefully (if I get a promotion and move locations) just under 8 miles each way. The reason I mention that is that I heard that having a bag inline with the center of the bike (like the topeak bag) is more aerodynamic and could potentially make a difference in commute speed over a relatively longer commute like that.