I have been doing Product Design and Development for quite some time now. With my experience, I have dealt with a number of Manufacturers everywhere in the Metro to nearby provinces. I can easily tell if the bag was manufactured in either of the two known bag manufacturing places we have in the Philippines, Marikina and Bulacan. They definitely have different styles and outputs in bag making.
Bulacan manufacturers are more into direct-sewing. Their process is fast and easy. They have an impressive sewing skills that they can manufacture 10,000 pcs of bags in 30 days. It is the definite choice if you have a simple design and needs it in bulk at the littlest production time possible.
On the other hand, Marikina manufacturers have a more complicated and intricate way of constructing a bag. Their expertise in shoe making reflects well on how they do bags. If you are looking for quality and luxury, Marikina is definitely the way to go. The bags are carefully constructed through a process they call "dikit" (glued). Basically, you'll have the full elements of a bag constructed using adhesive glue. When all parts and pieces are securely glued together, that is the only time they will sew it to perfection. It gives a more structured, seamless and fine finish. It may take a little more time though, but you are sure of the craftsmanship and quality on a given bag.