I've mentioned this a couple of times, in prior posts, but since you're bringing the subject up again, figured I'd chime-in to keep things current:
I've had a few incidents where my backpack was questioned. One, while exiting a 'Disabled' stall at a big-chain market. Seems someone complained that an upright man, 'Walking', was seen entering a handicapped stall, and some asshat complained to the store management.
When I calmly explained to the security guard/manager that were standing outside said stall, waiting for my exit from it, that I carry medically necessary supplies in the garment (backpack), allthewhile depositing the tied-off baggy containing my wettened incontinence supplies in the available trashcan,,,,
They both had that 'Look' of utter confusion/shock/surprise/embarrassment, and didn't push the issue to the point of checking my backpack, allowing me to go on my merry way and finish my shopping.
Another time, mostly the same thing, but at a movie theater. Going-in, I was stopped by a manager, and told I couldn't bring my backpack inside with me. They suspected I had video equipment inside, and that I might be trying to do something nefarious. Not wanting to open-up my pack in the lobby, I asked the manager if we could go somewhere more private (his office, it turned-out), and then explained to him the same situation. He looked 'Down' at my waist, and apparently decided that wasn't simply fat tissue causing my loin region to fill-out so much, and apologized to me, then let me on my way.
Lastly, but more importantly-
I had business at my local County Court House, and I knew I would be there awhile. Knowing my own needs for such products, I brought my pack in with me, along with the briefcase holding all the necessary paperwork for my court appearance. I live in a pretty rural County, and there are no x-ray machines to check 'Baggage'. The two Sheriffs standing duty at the entry, called me over, and asked what I was carrying (in my backpack). I don't mind that type of meet-and-greet by law enforcement, as they're merely doing their duty, protecting their post. I set the briefcase down, but didn't reach to remove my backpack (held-on by two shoulder straps, and secured to my back). I calmly explained my reason for being there that day and time, and pointed to the briefcase set down onto the floor, adding what it contained. I then shrugged my shoulders, and explained that my pack held the medically necessary supplies, should my condition warrant their need. Asked what that 'Need' might be? I told them.
Again, both had the composure to appear surprised/embarrassed, but didn't challenge me any further, so I went about my way.
Now, as to the OP about how being IC has caused me trouble?...
It has, and I resent it, every living day of this life.
That is my mountain to climb, and I am attempting to surmount it.
B.