How to wrap a bank transfer?

[TheThreeHeadedBeast]

Both dc are at university, they will have something to unwrap under the tree. However, their main present will be money as that is what they need & want.
Does anyone have ideas on how to wrap an online bank transfer...

I printed off fake money and wrapped it with things like jars of Nutella, chocolate coins, those cardboard envelopes from Amazon deliveries...

I've done this but since my children don't use cash anymore they return it to me so I can put it back in my emmergency stash and do an immediate bank transfer. That way they open something plus they will have no clue as to amount, so still have the surprise. Then do the practicalities later on.