Commuting Backpack

Hello
I need a new backpack for my commute as i've now got to transport my laptop to and from the office and my current one is too small.
I'm looking for some recommendations for a backpack that will fit a laptop that measures 38 x 26cm.
So far the only ones that looks any good are the Proviz ones.
I ride a drop bar road bike that's had the stem slammed, so needs to take that into account.
I need a new backpack for my commute as i've now got to transport my laptop to and from the office and my current one is too small.
I'm looking for some recommendations for a backpack that will fit a laptop that measures 38 x 26cm.
So far the only ones that looks any good are the Proviz ones.
I ride a drop bar road bike that's had the stem slammed, so needs to take that into account.
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https://www.carradice.co.uk/bags/saddle-packs-sqr-bags
https://www.amazon.co.uk/Lomo-Dry-Bag-Daysack-30L/dp/B00E8JFT4G/ref=asc_df_B00E8JFT4G/?tag=googshopuk-21&linkCode=df0&hvadid=310668525489&hvpos=&hvnetw=g&hvrand=15810700518207397560&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9045918&hvtargid=pla-499591871164&psc=1#ace-3536363283
It's essentially one big dry bag, with a small pocket on the front for keys. Its big enough for my 15" work laptop, plus a change of clothes and lock etc. No dedicated pocket for the laptop though. It's comfortable enough and cheap.
Felt Z6 2012
Red Arthur Caygill steel frame
Tall....
www.seewildlife.co.uk
It wan't cheap but I've had it for 5 years now and it looks as good as new.
i also sometimes ride a slammed bike into work and it's been fine as long as you do up the chest strap.
Mine's carbon and aero haha
FWIW - I rarely commute with my laptop but when I do I use an Osprey Escapist or (older + discontinued) Rapha backpack. The Rapha is very low profile which I like but the Osprey has better back/shoulder ventilation and more capacity.
https://www.ebay.co.uk/itm/383816659104
Everything else seemed too big for what I need so hopefully this will do. It's probably utter rubbish but worth a go.
Felt Z6 2012
Red Arthur Caygill steel frame
Tall....
www.seewildlife.co.uk
www.lomo.co.uk/acatalog/drybag-daypack.html
Backpack arrived. It's definitely cheap and I doubt it's waterproof as stated but it's just what I needed.
Laptop fits perfectly but the lack of a dedicated pocket meant I had to buy a neoprene sleeve for it too (makes it a bit more comfortable on my back).
Straps are good and it's plenty big enough for the laptop and my lunch/other random bits I take/bring home from work.
Overall. Very happy for the money. Exactly what I wanted for the odd trip to the office that I do now.