Case Logic DCB-302 on the left and Tamrac TEK 4390 on the right.

Size-wise, the 302 is a little bit smaller than the 4390. However the 4390 seems to have slightly thicker padding all around (except for the top flap). It also has full padding on the sides - where the 302's side panels have very minimal padding, and only up to the zipper. The most padding on the 302 is found in the rear panel and inner front panel (behind the accessory pocket).

The only zipper on the 4390 is for the accessory pocket in front - which is more roomy than the pocket on the 302. It's both wider and slightly deeper.