I too have The Urinall STP packer and I understand what you're saying about it being uncomfortable. What I did was pull the tubing back a bit as there is excess on the head end so that the peeing receptacle can be bent up or down behind the balls,I wear it in a jockstrap with the receptacle bent down between my legs until I need to use it but I have to make sure that the tube isn't kinked or there would be accidents. This is a great STP and can handle a full flow of urine,I have spoken to Dylan the owner and suggested making the receptacle out of some harder silicone,he said he did try to do this before but it didn't go well but he may try again in the future. Hope this helps you a bit,best of luck!
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