When Im in my tree I occationally have to go. Now I have used those wide mouthed bottles but have recently switched to ziplocks. Be sure to hold on to em good though! Now with a full ziplock I carry a wine cork with some pushpin tacks stuck in it and just hang the bag on the tree, opposite side of course. You dont want to be sitting back and think its a backrest for a second before she blows. At the end of the sit I lower it with my pullup rope and can dump it and throw the bag away. No need to wash nothing out. Now I had another thought. What if, while the bag was hanging, I opened it a bit so the scent would disperse possibly masking my scent? I have read that deer cant determine what animal different urines come from but Im not convinced, in fact they would probably know it was predator urine if it was on the ground with their nose planted in it, but wafting thru the air i wonder? It would be blowing downwind with my scent anyway so it probably wouldnt hurt and may help.