i have a double mama pad wetbag made by OUTRAGEOUS on the ozebaby site.

one side is for the dry mama pads
one side is for the used mama pads
both sides snap together

i would have a trial run, on a non-work day, to test out the system. e.g even though you're at home, pretend you have the same set up as at work, and use your system accordingly. Also, pack spares, JIC.