Thanks for your review.

As a bike/train commuter, I find looking for good backpack pannier to be something like searching for the Holy Grail.

I've now had several and haven't been happy yet:

• Banjo Brothers - a bit too small and closes weirdly (although is waterproof). Can not fit laptop.
  
• Bikase Outlier - good size (with laptop compartment) and comfortable, but the pannier hooks are unreliable and have had the bag fall off. I would really like this one except for that. (I do like the customer service here and they are supposedly reworking how the bag attaches.
  
• Evo backpack pannier - weirdly shaped (although almost big enough) and a bit to flimsy, but actually works better than I expected. Can't fit laptop. EDIT: Backpack straps broke. Build quality is really lacking and I'd therefore advice against it.
  
• Knog Dutch Dog backpack pannier - Won't easily fit on my rack. Big but not well organized insides.