Waders and relief when float tubing

[SkinnyLynnie]

All the discussion about the pros and cons of neoprene vs. breathable waders made me think of my number one problem with either type when I am out float tubing. Now this is a bit personal, but I bet I'm not the only one with this problem. It happens that as we get older we tend to need to relieve ourselves more often. At work, that means I visit the urinal in the restroom more often, but when I'm out float tubing (especially when I get cold) it's not always convenient to paddle clear in to the shore everytime I get the urge. And it's not very pleasant to keep on fishing when the pressure builds. I've tried a little plastic urinal (with a catheter and rubber tube) that you wear inside your waders strapped to your calf, but it's not very comfortable or convenient. I've heard that some people just let loose inside their waders and wash them out later, but I've only done that by accident. Any advice from float-tubing wader wearers with this same challenge?
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