Well my free backpack arrived today, and I must say it's a lot better than I expected. Looks like I can store a lot of gear in there, and there's a side panel for a small laptop if needed. It's also very well padded at the back for those extended jaunts.
Kudos to Olympus in offering this plus the HLD-4 grip to those early adopters of the E-3
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Some pics (apologies for the poor quality).