Hey Cleo :)
I've used HP for over a year now without a problem. I've had advice from two stoma nurses that it's safe to use in my bag (it's also safe to use as a mouthwash - the 3% isn't strong at all - not like the stuff used to bleach hair or anything which is possibly what the other stoma nurse is thinking of).
We don't pay for our products here in Australia, so it's actually costing me money to use the peroxide but it's money well spent, in my opinion, since I've tried all the other ostomy deodorisers that are available, incl M9 but none of them do the job quite as well for me as the peroxide does.
The loos at work are tiny so I just feel more comfortable leaving them odour free for the next person. I don't bother using it at home since I live alone - there's only me and the kitties :)
I have had an ileostomy for 31 years now due to UC.
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I'm not a complete idiot - some parts of me are missing!