I'm a hipster who rides a stripped down fixie, I don't want to bolt a bunch of crap onto my bike. Minimalism is my thing.
Really what prompted me to get it was this big sketchbook I have that I wanted to be able to ride around with, and there was no regular bag of any sort capable of holding it except the portage bag.
I've done lots of backcountry hiking so I'm not afraid of carrying a big heavy bag on my back for a few miles.
In general, you shouldn't be putting weight on your perineum (taint) when in the saddle. You should be putting weight on your ischial tuberosities (sit bones) instead. The former can result in blood circulation problems, and possible damage to the nerves and urethra.
Really what prompted me to get it was this big sketchbook I have that I wanted to be able to ride around with, and there was no regular bag of any sort capable of holding it except the portage bag.
I've done lots of backcountry hiking so I'm not afraid of carrying a big heavy bag on my back for a few miles.