Unless you're wearing REALLY tight pants (ie spandex) the receptacle doesn't show at all, and if it did, it'd just look like you're well endowed
The bag literally hangs from the receptacle. It has straps that allow it to be attached to the brief, but they recommend only using them for times when you're highly active, ie sports. I haven't used them yet. I just let the bag hang, and its been working great.
The only thing I'd like to try different is the bag itself. They make a "vented" bag, which is supposed to let excess air purge from the bag without allowing liquid to pass. I find that, when I'm up walking around a lot, the bag draws air and swells. I worry that'll cause a leak, but so far it hasn't...
MDL