I bought myself a Longchamp bag in fawn that I plan to use as my carry on luggage for holidays. Thought it would also come in handy if we do day trips for suncream etc. Wondering if I can get away with using it as beach bag too? Has anyone done this and can report whether the sand marks it etc? Don't want it wrecked as I'm also planning on using it for my laptop when I have to go into the office.