I'm going to tell you that there are SO many on the market if you just look at reviews from Amazon, you can find yourself one.
If you are looking however for one that can fit the most in I would look at Briggs and Riley.
I looked and researched and looked some more and their patent system of being able to compress everything in makes for the ability to really pack to the hilt. I can fit more in mine than any other suitcase I've ever had in my life. It's a system where you pack everything in and shut the case and hit it - it's actually fun LOL - so you can "overpack" and it'll still fit all.
It is extremely $$$$. Good god like a fortune. However, they have excellent customer service, you pretty much have a guarantee for life on it and as I said, there NOTHING you can pack more if it's a standard rolling case (so I guess if you want to use a pack maybe there's larger?). I swear by it. I use it for all my overseas trips and if I'm going for 10+ more days anywhere. That being said, you can def get away with something cheaper that can load up your average 35L of stuff in it for sure but I think this thing will do 50L.
For my family I have Monos, Travelpro and Calpak. I swear by my Briggs as the one that can pack the most of all these.
