Bringing an iPad and external HD seems a lot easier than bringing a larger MacBook Pro when traveling with its larger charger.
I see that iPad 3 also has a SD reader-lightning and lightning-USB connectors available. Is there a way or app (similar to LR) for the iPad 3 that allows it to catalog/transfer pictures onto an external HD? I was thinking first transfer the photos from SD to the iPad, then download from the iPad to the external HDD.