A good size book pack/day-pack should blend in without a problem if you end up needing more room.

BTDT piece of advice. Document everything. When they tell you what courses will be required, have them give it to you signed, dated, & a copy to the registrar's office. Same thing applies after she's accepted & her adviser states that class X can be substituted for class Y. I went through the first process with the last degree & have talked with people that got caught by the second.