No, it doesn't attach, but it IS small enough to fit under the handle of many cabs! I've rehearsed with mine many times, and gigged it a few times (usually when playing gigs where I'm mostly going through the PA), and I haven't had a problem yet.
Linus, there's a country band I play with that rehearses at loud but less-than-gig volumes, right on the cusp of should-I-wear-earplugs?
I play a Precision through the Elf into a Crazy 88 and it's (i) more than capable of holding its own, and (ii) utterly righteous.
Like any good, small cab it's significantly heavier than you think. My Crazy 8 weighs less than my old Barefaced OneTen, but not by that much. The Crazy 88 is definitely heavier.