|Small Micatech (8")|
|Medium Micatech (10")|
The smaller ones hold about 37L each, the larger ones around 45L each. To give a feeling for the difference: two one-gallon milk jugs more per case in the medium sized ones. That's quite a bit. Twice my compressed sleeping bag. Or 3/4 of our small tent. Or a set of hiking boots.
But on the other hand: 32.5" overall width with the smaller ones, 36.5" with the bigger ones.
Oh, and yes, I hate the low exhaust, too and if I get this rig will get a very narrow exhaust that goes between pannier and bike, not underneath the pannier.