Are camel-paks allowed on the bike in triathlons?

I seem to be getting conflicting info here. I think someone mentioned once that camel-paks are not allowed in IMs asnd HIMs, but i just saw one of the lead females wearing one coming out of T1 at IM Florida with a caamek-pak on her back. So are they allowed after all?

Yess, they are allowed as per USAT rules
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Actually they are no longer allowed in pro TTs. The UCI banned them effective from last year i believe. They weren’t allowed from last year’s Vuelta onwards.

Could you put one of those wings on the back our your camel back? Seems like it would help with aerodynamics. :o)

Dave