You should probably be more concerned with the width and height of the bag. Making it too much longer than necessary makes it harder to handle and fit in vehicles, but 166 is not what I would consider excessive. I've seen a lot of bags that are narrow and shallow. I have a 166 Burton bag for my 155 board only because I got the bag free, but it has 6" of vertical space in the shallowest areas and about 8" in the bindings area and is 13" wide and the narrowest areas(all inside dimensions). I can really load this bag up. Even my helmet fits with room to spare. I haven't tried putting a full weeks worth of everything in the back, just the snowboarding related items. My other clothes and so forth fit in my other carry on bag. Depending on what your "other clothing" is, with a large enough bag, you could make it work.