I saw a picture on Pinterest where wrapping paper was stored kinda on the ceiling of a closet. Looked like the rolls were just the right length to fit.
If you want underbed storage but your bed isnt high enough, you can buy little block things to put under the bed to raise it up.
I used those nets for years for stuffed animals and also used them in the bathtub to hold tub toys.
Could you possibly rent some storage space?
I love the idea of spacebags, but never could get them to work right.
How about shelves built around the tops of your kids bedrooms? You could store books, dolls, etc... I have seen shelves built over doorways too.
John 1:29 Behold the Lamb of God, who takes away the sin of the world
Revelation22:17 Both the Spirit and the bride say, "Come!"