I’ve used this eBags slim laptop backpack for the past few years and it’s worked out well and still looks great. It has lots of compartments and is very well thought out. You can slide it over your suitcases handles either upright, or sideways. I’ve had several folks ask me where I purchased it. When you look at it on the ebags website you can scroll down a bit and watch a video that tells everything about it. It’s on sale now too!

https://www.ebags.com/product/ebags/tls-professional-slim-laptop-backpack/249582