Certain 2013 model year Giant XTC Advanced SL 29er [0 and 1 models] bikes have been recalled by Product Safety Recalls Australia in-cooperation with the Giant Bicycle Co. Pty Ltd due to an issue the Contact SLR seatposts fitted to these models.

It also seems that after-market seat-posts that are black with “XTC” and “Giant” marked on the tubes may also break and hence are subject to this recall.

I have a little more detail on my blog post but basically the above pretty much covers it.