Why are the dng's coming out almost twice as large as the CR2's?

Never seen this or noticed before.
JUst did shoot on Canon 5D2. The CR2s are about 14-15mb, yet the DNGs, after conversion are 26-27mb.
What going on? If memory servers they are supposed to get smaller not huge.

Noel, thanks, I primarly like DNG, for getting rid of the sidecar, which I find annoying -- a 2nd file. Although I appreciate it's intended purpose of DNG --to be compatible years down the road.
So, not a space issue, I always knew that DNG only made the files a tad smaller, but to see the double in size was shocking.
The size on the CF card is 15mb, why does Canon camera say it's 10mb?
Yes, I usually later will delete the CR2s.  I do know that for blacks, the Canon DPP is nice to have etc. but, I think Jeff will agree, Adobe ACR is all we really need now for processing these. No need for the CR2's later as backup as I back up everything on several hardrives even offsite. Go ahead and disabuse me....on that issue
Jeff. if what you are saying is true, it's not really Raw, (and I not clear what that really means, it's not raw), --well let's put it this way, I bet you don't use or recommend then the small / medium Raws for the Canon Camera - if you use that camera.

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