Hello, I am an engineering student and I normally carry around 20lbs worth of school supplies. I have a 14” Macbook and iPad Pro M1. I do need a special section for those two. I also carry a 1.5L bottle and A4 spiral journals. Also how good is the water repellent surface, is there any leakage? How durable and comfortable is it especially for long walks or biking distances. Does anyone have photos of the inside’s compartments. Any information will be useful, thank you!