MicrostockGroup

I have a Lowepro CompuDaypack I use sometimes when I just need to carry a few things. It's a convertible style so you can keep a body and lens or two in the bottom. Then the upper area is divided into a compartment for a laptop and another that is basically open space. I use that compartment for tossing in things like a flash, cables and miscellaneous items that don't need to be in a little padded box. In the laptop compartment there is also a pocket that is just right for keeping a folder full of MRs and paperwork.

I wouldn't take it hiking because it's not streamlined for carrying tons of lenses and gear. It works great for times when your traveling with minimal gear and are close to civilization though. Mines maybe 3 years old and still look new .. oh yeah it also has a pocket on the front to hold a mp3 player with the hole for the earphone to push through. I use it to hold a PDA but since your biking you might like the mp3 idea.

Looks like they cut the price in half since I got mine too .. Here's one on amazon for $55 new and free shipping
http://www.amazon.com/Lowepro-CompuDaypack-Camera-Slate-Gray/dp/B000EY5R8C

I got Lowepro Micro Trekker 200 for years. Indestructible. Maybe now there are better models but it is good enough for me. For portability I use Tamrac Tele-Zoom Pak with attachments for additional stuff. I took it for my 4 day trek on Inca Trail where I wanted to save on every gram I was carrying with me so I got body with one lens attached to it in main bag plus another lens in side holder attached to it. You can really attach two like this so I could carry almost all stuff I got in my backpack.

I don't know but now I'm sitting here shopping for a new camera bag .. LOL thanks a lot. I'm thinking about a National Geographic Earth Explorer .. get me some kahki pants and hawaiian shirts to match it and I will be styling. 

Check out Lowepro Rover AW II:

http://products.lowepro.com/product/Rover-AW-II,2024,14.htm

I am very happy with mine. You can attach a tripod and in the upper compartment there is room for a jacket and some snacks.
Excellent quality.

Thanks all.  I looked at all the suggestions.  That convinced me I'll need to go to the stores and actually see and examine these bags to select one.  When cycling, the bag lays on your back and exposed to the sun, so it gets hot.  Therefore it should be small and have a mesh back.  It also needs adequate foam between the camera and your back when you hit a pothole.   Locally it appears that BestBuy and REI have a lot of these bags, including the brands mentioned here.

Err... I don't know in which gentle town you live but in the Philippines, everything in a backpack would be gone faster than you think. Sharp razor blades can cut easily through any fancy canvass.

Don't bother going to BestBuy - they won't have what you're looking for either.

Your best bet to try something on will be to visit a camera shop the local pros and serious hobbyists use, which isn't going to be a franchised national chain type of place. If you don't know what/where that is, a call to a local commercial photographer or contacting a camera club will get you pointed in the right direction. These types of stores aren't high volume, so be prepared to pay a bit more for the convenience of having a bunch of stuff in stock.

I second that motion .. avoid shops in the mall like those Ritz & Wolf stores .. the mom n' pop shops carry all the cool toys 

not the backpack, just its content will leave your back

at least here in italy, not only in philippines

Kata 3N1 has become my favourite. I have the 3N1-30. Very fast if you need it to be.

http://www.adorama.com/Als/SearchPage/Kata+3N1/?Count=10&SearchInfo=Kata+3N1

Looks like we have enough material for a Wiki on camera backpacks.  I went to a serious camera shop and they had several candidates in stock.  I bought an MRock 674.

For cycling, a pack has to be small and fit tight - big loose bags slosh back and forth as you pedal, and are too hot. Your arms are stretched out straight in front of you so the straps and pads can't be too wide, or they cut into your shoulders.  Basically I bought the smallest bag that was built for a DSLR.  I'll probably add a waist strap to hold it even tighter.

I live in Minneapolis and if you think it's a peaceful, safe midwestern town, think again.  And I've traveled enough to know  about pickpockets and street scammers, and they aren't going to score on me without a struggle.  ( A friend of mine visited Paris a couple years ago and his wallet was gone before he even got out of the Gare du Nord train station.)