Here is the most compact and handy OTG solution, relatively small thus it's easy to carry and move, keeps things neat.

https://www.amazon.com/CableCreation-Braided-Compatible-Function-Aluminum/dp/B01M098EAG/ref=sr_1_3?keywords=cablecreation+otg&qid=1563330338&s=electronics&sr=1-3

https://www.amazon.com/CableCreation-Adapter-Compatible-Android-Aluminum/dp/B01MQV75YX/ref=sr_1_11?keywords=cablecreation+otg&qid=1563330338&s=electronics&sr=1-11

They have more types of cables and connectors, you can browse the store. Hope this helps :)