Heavy and seemingly durable canvas lining. I was deterred at first to buy this bag due to the price, but am now glad I did. I decided to move up from a backpack to a more traditional briefcase and this one looked good. Full Grain is the highest quality essentially and genuine leather is the "leftover.
So, my Top Secret Garcinia experience was neither super impressive, nor super disappointing. I did like that there were no jitters and no feelings of nausea (some of the other brands, like Simply Garcinia left me feeling a bit woozy on an empty stomach). The weight loss with Top Secret Nutrition was eh, average, but again, if you have a sensitive stomach, it's a pretty decent trade off.