Ulvö Rolltop 30

I have an Ulvo Rolltop 30 for about a year now, and I'm very happy with it. It went through plenty of rain while cycling to/from work; the inside stayed completely dry. I put my macbook (with leather sleeve) in the backpack without second thought, even if there's heavy rain.

If you want something that's big enough to go away and small enough to be a daypack a rolltop is the way to go. I have a Fjallraven Ulvo 30L backpack. It's the ultimate shape shifter. It can hold way more than 30L unrolled but it can look like a cute little daypack all rolled up. It's actually water