First Time Flashlighter Looking For The Right Fit

Please give me some recommendations about flashlight types/models that would best suit what I’m looking for. I need a light that’s bright (obviously) and can easily fit in my pocket. It’s for my job (I work in a printing press warehouse) and it’s very physical so I cant always have a huge bulge in my pocket. The slimmer and smaller the better (especially the slim part, I don’t mind if it’s a bit longer) but I’m totally ignorant and don’t know what the best lumen output or anything is, so I’m stating from the bare ground. Thanks in advance! Any information is most appreciated