These Keycap Trays are perfect to store your keycaps each hold 10x10=100 keycaps. They can stay and hold tall keycaps. 

They are mainly meant to hold 1u keycaps. 
While longer keycaps can still fit, they would not benefit from the small features built into the bottom surface. 

The bottom of each cell has cure, enabling you to easily tilt the keycaps for an easier access, making it easy to pick them back up. 
Dividers between each sections keeps the keycaps within their respective place. 
Hole in the center allow to store and protect low profile keycaps that have protruding Choc stems or even MX stems.