Nope, treat it the same as your other diapers. No cover needed!
I LOVE our Kawaii minky bamboo diapers (I have 10 of them lol)! No cover needed. Just use as a regular pocket diaper. Do note that the bamboo inserts take A LOT of prepping to bring up to full absorbency. For the longest they drove me nuts and I always had to use both of the inserts. Now I just need one insert. In fact, DS is currently using these diapers at night with both bamboo inserts and 1 hemp added in with them. And this is the kid who was soaking through a mother's ease sandy's fitted with a soaker at one point! We have to watch out for heat rash, and this diaper does not give DS a rash when outside as long as there's just one bamboo insert.
And Kayla (cause I know you've paid attention to my saga with these), I solved my floppy problem by always line drying the inserts. They're stiffer, but not too stiff.
~Jackie, mommy to Aiden (11/2/10) and Zoe (VBAC 11/27/12)