I'm not entirely convinced by the BPA is an immediate threat toxin, however SIGG lied to the company Patagonia about BPA in their liners, and that damages SIGG's credibility no matter what the outcome of the debate.

From Rick Ridgeway, Patagonia's VP of Environmental Initiatives:

"Once we concluded there was basis for concern (regarding BPA), we immediately pulled all drinking bottles that contained BPA from our shelves and then searched for a BPA-free bottle. We very clearly asked SIGG if there was BPA in their bottles and their liners, and they clearly said there was not."

Patagonia has recalled all their co-branded SIGG bottles.

SIGG later introduced the EcoCare Liner.

SIGG is also offering, until the end of October, to exchange all pre-ecocare liner SIGG bottles for the cost of shipping.

SIGG isn't concerned about BPA being harmful, but they are concerned that potential customers, past and future, are concerned about the issue, enough so to replace their liner, replace old bottle and to lie about it in the first place.