I'm considering picking up a Topeak seat rack and bag system. I found these great looking light touring bags, that look rather cool and handy. Not sure how convenient they are for very short commuting needs to work and gym/track.

My intent for the bag is to carry a lunch, pants, shirt, socks, light towel, possibly a sweater and light toiletry kit.. Maybe some minimal tools and tube/pump.

Could anybody comment on pro/cons of the 2 systems? Here are the 3 top options I'm currently considering.

Topeak Bag is $90 rack is $60
Bag: http://www.topeak.com/products/Bags/MTXTrunkBagDX
rack: http://www.topeak.com/products/Racks/MTXBeamRackE-Type

Arkel: rack is $99 bag is 124
http://www.arkel-od.com/us/all-categ...neur-rack.html
http://www.arkel-od.com/us/all-categ...tailrider.html

Revelate Design: $125-130
https://www.revelatedesigns.com/inde...=4&ProductID=7
https://www.revelatedesigns.com/inde...=4&ProductID=1

Thanks for you input!