The Mamiya RB67 is a big, heavy camera- no way around that. But it has a number of unique capabilities that make it worth hauling around: it shoots in the convenient 6x7 image format, which is the correct proportion to print a traditional 8x10 image without cropping; it has a tremendous built-in extension, for near-macro shots with nearly any lens; the rotating back lets you shoot vertical or horizontal without rotating the whole camera; and it's fully mechanical, so you don't need to worry about keeping it fed with batteries. This RB67 is in very good cosmetic condition, with some paint and surface wear. Function is excellent, and there are new light seals in the included 120 rollfilm back. A solid classic medium format camera in good shape- just add a lens.
