Update - people have given me many options, thanks for all your ideas. I don't need any more options unless you've found something awesome and cheap :)

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I'm looking for a new a backpack for daily use. There are heaps of online options, I wondered if anyone here had any good ideas. Last time I needed a bag I went to a store and bought one, which has been ok, but there are many many options now.

I don't want anything too large or heavy. I drive in and walk a block or two to work. I'm a consultant who largely works in one place, but sometimes moves between customer sites, so I carry basics like painkillers, mouse, 

Requirements / I need to carry daily:

• A compact laptop (Surface Pro)
• A very thin A4 folder to keep documents inside
• A few sets of keys
• Very compact first aid kit (plasters, painkillers)
• Sunglasses
• Bluetooth headset for phone
• Sometimes I need to carry something a bit larger, the size of a six pack of cans, but that's not essential.

I don't need anything like drink bottles, straps to carry things on the outside like hiking bags, etc. Some kind of compartments to divide the many random things I carry would be useful, maybe even zipped from the outside but that's not essential.

Any suggestions or ideas?