pseub: Fyi, I think that the Rive Gauche tote actually comes in two sizes (in addition to the small Rive Gauche satchel). I've seen them at my local YSL boutique. These were the dimensions posted by another member, writetoshirley...
"It comes in 2 sizes -
Medium: $1395, size of a laptop (but won't actually fit a laptop), probably ~9X12X3
Large: $1495, definitely fit a Dell laptop and papers, ~12X15X4"