I'm starting this thread as a permanent place to post about tools, gadgets or equipment you've purchased and found useful for your practice of CR. I hope it will become a resource of veterans and for people new to CR. I'm posting a new tool myself, a stainless steel travel tumbler, see below. And I'm copying a couple posts by me and others from elsewhere to this thread to seed it with content and so the cool tools are all in one place for future reference.
Please feel free to post tools you've found most helpful for your practice of CR!
--Dean