I used to use this storage system for my sneakers:

SONGMICS Shoe Rack, Space-Saving 15-Slot Plastic Shoe Storage Organizer Unit, Shoe Cabinet, Ideal for Entryway Hallway Closet Garage, 44.5 x 14.2 x 34.6 Inches, White ULPC44S https://www.amazon.com/dp/B074H1WTQX/ref=cm_sw_r_cp_api_glt_i_9GVCB25TFME172GYV9N7?_encoding=UTF8&psc=1

Very stable, expandable, and takes up a fair bit less space than drop boxes. Price is right too.

Bunch of different colour options as well