Those backpacks are all fine.....if you want to look like the 40 year old virgin!
I keed I keed :hugs:
But seriously, look into the Dakine Sequence backpack. I ordered a clik elite compact at first, but returned it for the Sequence. It has a bunch of space, I'm pretty sure I could fit a small family inside. The inner camera compartment is also removable, and it has a shoulder strap so you can use it as a shoulder bag if you wish. The downside is that it is big, so its not going to be anything compact on your back. But by far my favorite feature is that it opens from the back, where your back rests. This is great because you can set it down on the ground, open it up and get your stuff out easily, and put it back on your back without getting dirty since the outside rests on the ground. Perfect for beaches, hiking, skiing, etc. Also, its much harder for gear to fall out if you leave the zipper open and its impossible for thieves to get at your gear when its on your back. It also had a removable rain cover and tripod straps, as well a bunch of other huge pockets. Also, one thing you cant see in the photo, it has a waist strap with two felt-ish pockets on each side, which is perfect for lens caps or other stuff you want to access quickly. Another big plus is that it doesn't look at all like a camera backpack, so it doesn't become a target like something with big CANON or LOWEPRO letters. I have the black version with the gray straps, but they have two different colors each design year.
The only downside is the price. Its $160, but I ended up getting mine for $129 with shipping. I got it from ebags.com, when they were having a 20% off any single item sale, which they have quite often. I ended up getting it for $120 plus $9 for shipping.
Here's the manufacturers site, but look on google or especially Flickr for some much better shots.
DAKINE : SEQUENCE