I think the overboard dump is the best option. Most of the cavers around here that wear dry suits and do longer dives have adopted this approach. I've seen all of the options that you list used. On the longer dives, both the collection bag and the "depends" have over flowed. The overboard dump consists of an external catheter, flexible tubing (non-kinking) and an outlet (with or without valve). I have heard of an external catheter for women. hope this helps
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