Mmmm... To be honest, I just avoid going to the bathroom while out of my house. If I just can't hold it, then I just go into a stall. On the other hand, I've read about getting a thin lid, and use it to pee, holding it and giving it a tube-like shape. Something like that.
And, @PainKiller, I wouldn't say someone wouldn't pass without a bulge. I actually do fine without it (in my case, my voice, my height and my baby face don't help at all, but I pass around 60%-70% of the time anyway). So the bulge... I wouldn't say is crucial, at all. Unless you used some really skinny jeans or something.
Sent from my Redmi Note 3 using Tapatalk