Hello, if you get a cage from a cubelet, that means you can use them in all gamemodes that use single personal cages, such as SkyWars, EggWars, Lucky Islands and more. You can enable them via the Loot menu:
1. Click the poppy on hotbar, called "Loot".
2. When the menu appears, look for the glass icon called "Cages".
3. Then another menu will appear, showing you all of your cages that you have, browse then find one and click it.
4. Boom! So simple and now you have a cage selected.
Thanks!
Locked.