I was on the crew for most of season 3. For Christmas, the production gave the full time crew members an expensive backpack with a "LO3T" patch embroidered on. Obviously the "3" was for season 3.
The brand of the backpack is OGIO: mastermind. Below is a link to the backpack. There is a laptop compartment, audio pocket, a ton of pockets of all sizes and so on.
For Sale: LOST Season 3 Crew Backpack
Threaded Mode