The Namaste Monroe bag is what I'm saving up for (note: add to growing list of things DH should buy me for my birthday). Not in pink I have to say - it comes in a lovely lime green colour - here it is on Amazon. This has better photos so you can see it fastens shut.
Also if you are not going out and about a floorstanding bag is good. Or one that has enough structure to stand up by itself on the floor, and a light coloured lining so you can grovel about in it for lost things
OK, are you looking to treat yourself? I tend to have each project in a separate bag, maybe not with all the yarn. I just use any bag I spot: shoppers, calico bags, I do have one of those granny ones in a Liberty print. Maybe have a look at Next or Accessorise or Cath Kidston for a roomy tote bag?