Another challenge

For the first-time, I make such a big shoulder bag. I had been thinking about the design and how to attach all the parts together for a couple of weeks before I started this BIG challenge. The final product turned out a bit different from my thought - the zip part. It looked nicer and more neat after I enclosed the edge of both ends and sides. I especially added extra hard interface for the base so that the bag can carry heavier items such as water bottle and books. The bag looked like patched work but it is not. It is the original fabric that looks like this. This is also the first bag I done with so many pockets - two opened pockets and one zipped pocket in the main compartment and two pockets in front, total five pockets. Can you guess the length of the zip I used? It is an 20' inches zip in black. Waa... glad I can complete this BIG challenge. Praise The Lord!

45cm (L) X 30cm (H) X 10cm (W)