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If you're referring to the Halcyon verus OMS comparison at the bottom of the page, the Halcyon wing that they are comparing to is a several year old design. The zipper flap in the 55lb Halcyon wing I have is cordura, not inner tube. And I've never had inflation problems on the dives I've done with it.Scuba446 once bubbled...
I thought that this web site was pretty interesting:
http://www.omsdive.com/faq-bc.html#faq-bc