Backpack?

[Pat D. Stephens]

I've found that when I travel by plane, I prefer a smallish backpack as 
a 'purse' and a pull along small on- board piece.  I prefer not to have 
more than 12 lbs for the weight of my backpack.  Can anyone tell me of 
a lightweight backpack that will fit my iBook or TiBook?  One is 12" 
and the TiBook is a bit larger.  I will want it to carry emergency 
items as well.  I believe since I want it as light as possible, I'd 
prefer nylon, but padded?

Pat