Recommended solar suitcase

I used the MC4 connector from Amazon shown below....as my suitcase panel already had MC4 connectors. 
 
https://www.amazon.com/Cutting-Edge-Power-Weatherproof-Connectors/dp/B07MMWKR29/ref=sr_1_3?dchild=1&keywords=cutting+edge+power+MC4+entry+cable+connector&qid=1620644383&sr=8-3

I cut the small end connectors off and inserted the wires into my controller.