I just purchased the Bopai Intelligent Increase Backpack and am very impressed by how well thought out the design is, the styling, and perceived quality for the price. As context, I am a professional consultant that travels often but am not an extreme road warrior anymore, and I sought a solution that would be highly functional, fit for use, and professional looking.First, the design is very well thought out, and if you have seen Bopai's video on this, you should take a look because it really does cover the bases. In terms of my standard professional setup, I carry a Lenovo Carbon X1 laptop, a iPad for note taking, an over the ear headset that folds somewhat flat (~1.5"), backup powerpack (which can plug into the inside of the backpack and be accessible through a USB port on the outside of the backpack), power adapters, business cards, medicines, money, pens, travel wipes, light toiletries, etc. in the main inner compartment. I may also carry 1.5-2" of documents and papers in the secondary outer compartment. I use the backpack's secret compartment for my passport and sometimes other small critical items. I use the hideable outer pocket for my umbrella. I can fit this all into the backpack without engaging the expandable section of the backpack. While I haven't done it yet, I could easily expand the backpack to carry a Hydro Flask and light change of clothes. One strap of the backpack has a small card slot, which is convenient for putting a metro card, whether it is an Oyster Card for London or an Easy Card for Taipei. There are handles which allow the backpack to be carried from either the top or the side. The side one is clever in the sense that the normal straps of the backpack can actually be hidden completely away and the backpack can be carried sideways more like an attache case. I have not tested the waterproof or resistant characteristics of the backpack, but the ballistic nylon looks to be tight enough to repel and resist moderate rain. Hard to say about whether the zippers would resist a long, heavy downpour on top of the bag.Second, the backpack is quite stylish to my eyes and preserves its form when packed or unpacked (i.e., not completely an unstructured backpack). As context, I have a Tumi Narita attache (was $695 new), which is a slim bag that has a mixture of leather and ballistic nylon, and I use that attache when I go to more formal meetings. The styling on the Bopai really has quite a similar vibe to my Tumi Narita, and I would be very comfortable carrying this backpack into almost any professional setting. In the two pictures I’ve submitted, the Bopai backpack is on the left and the Tumi attache is on the right.Third, the price quality tradeoff seems to be good, provided that the backpack lasts at least 2 years, hopefully longer, say 5-8. My Tumi gear usually lasts 10 years +/-. I could see the Bopai gear lasting quite awhile too, but it is unknown at this point. A lot of people seem to have reported zipper issues in the past. I don't immediately see where zipper issues might occur, but it's these types of fine points (e.g., zipper points, stitch failure, strap tears) where gear can become unusable.At this point, I recommend the Bopai backpack if you are looking for a professional backpack and carry a moderate amount of stuff on a daily basis. I am not sure I would carry thick, heavy textbooks in this backpack, mostly because this backpack looks more professional than rugged.I'll update this post if I run into issues, but I could see myself becoming a longer-term Bopai proponent.