Hi this is Peggy. You need to store boots upright. Hope this will help you. You can also cut pool noodles and put them in the boots. Good luck Steps
4 Ways to Store Knee High Boots - wikiHow
Pvc pipe or pool noodles inside the to keep them upright. You can also hand them up in your closet if you have space using trouser coat hangers with the clips on them.
Boots can be stored upright or stacked in their original boxes on shelves, with boot shapers inserted to keep the form. They are available in wood, plastic, or plastic with a spring loaded mechanism which keeps the leg of the boot expanded.