I carry a backpack. That way I can fit normal purse stuff, ostomy supplies, and a large water bottle.
I'm probably gonna jynx myself now, but I don't carry anything in any way anymore throughout my day to day activities. For the first year or so I had a little bag in my back pack for school, never needed it, so stopped bringing it. I haven't ever since. At work, due to the physical nature and extremely unpredictable way things can go, I keep a spare in my duffle bag burried at the bottom. I just try and stay proactive with work, and ensure I have a fresh pouch before my 2 day shifts and a fresh pouch before my 2 night shifts. If there is a failure in there, I haven't duffle bag with my rehab gear on the truck but it would most likely be something catastrophic that would involve being hurt and a leaky poo bag would be the least of my concerns. I say that only because I've put a lot of stress on my pouches over the years, and the only time there has ever been a failure has been due to my own laziness or lack of diligence in ensuring I freshened up recently.
This may sound funny, but in a pinch, I've used duct tape to slap everything together to hold it in place for a few hours or whatever till I get home. Quicker and easier .
Traveling I just carry it all in my back pack normally.
Hope that helps
sorry but i am small and use the bag sent to me by convetec. i use a larger purse