Baby Shower Invite..wording help!

Anne C • 29 | Nurse | Mom of 1 💘| Due in Aug w/ #2 | two angel babies
For my invite we want to encourage people to bring a pack of diapers as its an easy cheap gift. We don't want everyone to feel obligated to buy an actual gift so would it be tacky to put something like this on the invite?
"A package of diapers will do but should you feel inclined to shop we have registered for your convenience at ____________"
Or something of the sort? I'm the worst at this stuff!