It fits a lot. Gets heavy though & I was using it to avoid lifting but still had to lift it. It often tips to one side on curb drops. But it's got a lot of space. I only use it on small trips now & may sell it. It fit my big laptop but just barely, plus TONS of other stuff. I never used the backpack part. I like that it stays up when I stop. If you're looking for a quality product it is really well made. Zippers are great & space is shockingly ample. The front pouch is a bit too low so some of those internal features are lost without digging.