Packing a soft saddle bag correctly is a slight pain, and removal/putting on takes a few minutes sometimes.
If it just going to be mostly used for commuting i'd got for hard one which doesn't have to be packed carefully like the carradice sqr http://www.carradice.co.uk/index.php?page_id=product&under=range&product_id=57
Bear in mind, that any small items put into this hard case will rattle around and come out like they've been in a blender. I actually destroyed a multitool with mine! (Wore clean though the frame with some keys!)
@Kidneys started
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Packing a soft saddle bag correctly is a slight pain, and removal/putting on takes a few minutes sometimes.
If it just going to be mostly used for commuting i'd got for hard one which doesn't have to be packed carefully like the carradice sqr http://www.carradice.co.uk/index.php?page_id=product&under=range&product_id=57