I was out doing my rounds when I came across two carabiner multi-tools at different stores.

The one on the right is built like a tank and included a locking gate via a bulky sleeve that screws up or down. The bulky carabiner also features a small LED torch. It is rather thick, and thus, the right carabiner also gives you an option to hang some keys off of a small loop located at the bottom.
The left carabiner is much cheaper in construction and overall execution. No need for a separate key loop however, as this one isn't far off from the typical carabiner dimensions.
