Can anyone recommend a handbag that's big enough for a laptop? Any colour, budget up to about £200, needs to have a long strap so I can carry it under my arm. My main requirement is that the laptop compartment can be fully zipped up to protect it from the rain! Most that I've seen are open or close with a popper/buckle, or they're just not big enough for my laptop to fit in the zipped part. Thanks in advance!