How do you add your logo to your packaging? So far we've been using circular labels with our logo printed on it, but I'd prefer something that looks more permanent. I've been looking at stamps, but then we'd have to choose a single color and I'd prefer not to do that with our logo. We'd be using it on boxes (e.g. for our pens), bags, shipping boxes, etc, so versatility is important.
What do you use for your branding on packaging?