Not finding out gender, how can i be prepared

I want to be surprised and find out the babys gender at birth but I will need a car seat beforehand. My sister has a girly carseat I love that her baby just outgrew and would love to use it if i have a girl but if its a boy ill need a gender neutral one or a boy color…

How will i be prepared without knowing gender?

I also dont want to let anyone else find out either. everyone be surprised

(The carseat has flowers on it)