Tern HQ bag
 

I got the Tern HQ bag (at $100) as a smaller, lighter alternative to the Tern Go-to bag which I already owned but often found too capacious for my everyday needs. Like the Go-to, the HQ is exceptionally well made, with storage compartments aplenty. Turns out it can just fit a 14" laptop too. Highly recommended.
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Another testimony...
 

I got caught in a tropical torrential downpour yesterday, one that produced flooding in parts of the city. I rode through it for about half an hour getting thoroughly soaked within minutes. But my concern was the laptop that I was carrying in the Tern HQ bag mounted on the bike.

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Stopping to check that the laptop was not soup

I put the included rain cover on and kept cycling. It was getting late so I had to make time to get home before dark. My concern about ruining the laptop was unfounded. The laptop stayed dry throughout. Thumbs up once again for the Tern HQ bag.

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Drying out the rain cover

Nice looking and functioning bag, especially for critical application like a laptop. Looks just like a quality laptop bag. Thanks for the good review.

In recent decades as less people used laptops, really expensive cases for them, like by Tumi and others, originally hundreds of dollars, I find used for $20, sometimes $10 at the thrift shop, sometimes $5 at a university surplus store that I used to frequent, all in mint condition. I've used them for many things other than laptops. If I ever setup a bike with a front block, I may get one of those mount frames that can convert any bag to that function. My current panniers certainly are not waterproof. For critical stuff, like my phone, even in a supposedly waterproof bag or backpack, I'll put the item(s) first into a heavy plastic bag (usually a bubble-plastic shipping envelope, for padding too), then into the bag, it's cheap insurance without much effort.