Lowepro Mini Trekker vs. Compu Trekker AW...big difference in size???

Hey gang,

So I already have a Lowepro Computrekker AW that I really like, but sometimes it's just too big...so I'm thinking of something a little smaller, but not quite as small as my Tamrac 5371.

There's a local guy selling a Mini Trekker...how does it compare to the Compu Trekker in terms of size? From photos they look to be almost the same...

Is there any point in getting the Mini Trekker if I already have the Compu Trekker? Does the MT have anything nice about it the CT doesn't?

Thanks,
Tamas

Oh come ONNNNN...I know most of you guys are backpack/bag geeks...help a brother out!