Bearbreeder Personally, I think the only thing I would realistically EDC is a rechargeable keychain light and that doesn’t need a clip (but the expensive Jetbeam Mini-TI EDC has one). 40mm x 14mm sounds so practical. I’m not sure where the limit is, whether ~60mm, but at 70mm I start having second thoughts. I didn’t know they even existed before this thread, which is what has me so exited about this off-topic detour from 18650 lights that I would not EDC. I should probably make a separate thread for this topic.
One thing I have had for years on my keychain is a SuperTalent Pico USB drive:
I didn’t weigh it but 6g seems about right and a delightful 30mm x 12mm x 3mm. Durable, practical, and a fun conversation piece.
Makes sense. Watching lots of beamshot comparison videos is slowly giving me a better idea of what it’s like.
Lightbringer Wow that Nitecore MH20 has it all. I guess it better at that price. But really nice. Oh, and in a review, Mocarny put a Lumentop EDC Pico through the washing machine and a vacuum cleaner with positive results. 
Thanks patmurris for a very nice selection of lights! You are all making it very difficult to stick to the plan of “just one or two” and I am noobishly trying to stay determined! I had my eye on the Eagle Eye X1R, but in video reviews the SP40 had a nicer beam and better brightness.
Out of curiosity, why are tube lights so much more popular than 90 degree lights? At first I thought the latter looked weird, but after thinking about it, it seems to me to be the most versatile.