Well, today's been fairly productive... I almost got it finished- only the straps, eyelets and hoops to add. Here's how it looks so far...
I'm just typing up the tutorial so far, that will be added to the how-to's textiles page very soon, and tomorrow I'll have my bag completely finished.
As you'll see by the tutorial I tend to make things up as I go along- you really don't need a pattern if you understand the construction rules. If you want to follow the tutorial I began with 1m of 45cm fabric and quilted 60 5" squares for the main piece. I cut the bag the whole length of the piece at 16 1/2" deep. That should give you a gauge for the other pieces. The straps are the whole length and 4 1/2" wide. Pockets, flap and all the loops can be whatever size you like depending on how much fabric you have left to play with.
Although I've reiterated this in the tutorial here is a basic list of pieces you will need from 2 1m pieces;
2x 36 x 16 1/2" main body
2x 14 x 5" base
2x 36 x 4 1/2" straps
2x 5 x 9" pockets or to size
2x 6 x 2" strap loops
2x 5 x 5" strap reinforcements
2x 4 x 2 1/2" loops
These should easily fit into 2 m of fabric- the straps, loops and reinforcements can be from one piece or both, whatever you decide.
Check back tomorrow for the completed bag...