--the exterior paint can be damaged (interior lining is NOT affected).
--the narrow neck means the dishwasher spray can't clean the entire bottle so it may not be really clean.
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mama to (4/05), (6/07vbac), (8/09vbac), and (9/11vbac)
I've been on the fence about SIGG bottles, but knowing they can go in the dishwasher makes the decision easier.
Mom to DD1 (11/1999), DD2 (07/2003), and DS (11/2012), all born at home and cloth diapered.