I've used Jansport since high school and there's a lot to be said about them, but I find their quality has been really hit-or-miss over the years. My current backpack is a freebie from one of DH's former employers because the zippers for my last Jansport are finicky ... and the Jansport doesn't have a water bottle pocket.
I bought DD an LLB backpack when she was in Kindergarten and she's still using it; we may replace it for middle school and will expect it to last through high school. I don't remember which model, but it wasn't a Bookpack; it might be the Explorer.
It has a padded laptop pocket and decent-sized water bottle pockets; she hasn't complained about it, although it's just now (6 years later) showing a bit of wear on the inside and on the bottom. I've run it through the washing machine a few times to remove vomit and/or travel funk, and it's come through fine (it says spot-clean, but if you throw it in a mesh bag, wash on cold, and let it air dry, it does pretty well.)
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Liz
DD (3/2010)
"Make mistakes! Get messy!" - Miss Frizzle