Macpac Korora 16L AzTec® Backpack

Storage: I can just fit my 13" laptop in the spacer mesh in the main compartment. If you have a 15" or 17" laptop, it may be tricky, so I would look at larger options. But otherwise, its a pretty compact backpack with a sleek profile. It also has 2 side bottle-pockets which are large and secure enough to fit most bottles (unlike some other bags which are so shallow that you're scared of the bottle falling out every time you bend over to tie shoe lace. Great if you're on the go and only need something small to carry the essentials.

Water-resistance: The canvas and nylon materials are pretty rugged and has decent water resistance. I splashed some water to test it out, it formed small beads and didn't soak into the fabric so I was pretty satisfied. It should be able to handle light-moderate rain, but the zippers are not as well covered as I hoped so in prolonged rain/heavy rain, the water will seep through slightly from the zippers.

Overall: Good quality of materials, and excellent construction quality with lots of reinforced stitching. Good all purpose backpack. Its functional, durable, and water-resistant enough for adventuring and travelling almost anywhere. The muted look also makes it a great choice for work or uni. Good, compact, all-purpose bag. Its slightly pricier than the kahuna 18, and you're paying for the better canvas material, water bottle pockets, and a small external pocket uptop for easier access. Although the Kahuna offers more colour options.

Just bought the Korora 16. Good build quality and materials. I splashed some water on it to test the water-resistance and it was pretty solid (formed a few beads). Should be able to handle light-moderate rain. Storage-wise it can fit my 13" laptop. 15" laptops might just fit, but anything bigger would be tricky. If you want something that will carry just the essentials, this is a good all-purpose compact backpack for work, school or travel.