I got a set of those. They are very small diameter and no handle. They packed wonderfully! Unfortunately they were very hard for me to get any significant sparks on target, especially with gloves on. I realized that I needed something bigger that I was competent to use reliably. The boyscout hotspark is a larger diameter which gives a bit more spark and a handle that makes it easier for me to position and control, and at roughly half the price. I found this to be the minimum size I could actually reliably use. I have read that there are better quality ones available, but for me it was a size issue.

If size is a prime consideration, please practice with the actual mini item, whatever it is, and make sure that it is plenty big to actually do the job for you instead of just having a false sense of security. If you are not an arthritic clutz like me, you may be able to get away with more mini stuff, but either way, know for sure by practicing with the real stuff.