If you are more reserved in your packing you could probably get 6-7 if you use the extension. Bag looks much smaller in person, but fits a ton, I got a laptop, 5 days of clothes, a toiletry bag, 10 days of diabetes supplies, a full size notepad, and a book or two in without using the extension.
https://www.amazon.com/Plambag-Canvas-Duffle-Overnight-Weekend/dp/B07P4LLD53