I was lost another SD card yesterday when one of the plastic splines between the contacts broke. I have a long trip, including a photography workshop, coming up, so I started looking at new cards. I though it would be prudent to actually check how big the image files are for the two bodies I'll have with me, the E-M1 and GX7. I always shoot Raw+JPG (Large/Fine) in 4:3 format. Here's what I found by looking at my actual image files, which seems strange to me: E-M1 - Raw: ~15MB (manual says 17MB) - JPG: ~8MB (manual says 7.5MB) GX7 - Raw: ~20MB (manual says 68 Raw+JPG images on 2GB card, or about 29MB for Raw+JPG Large) - JPG: ~7MB I can understand why the jpegs are different, and why there's a fair amount of variability within each camera. I don't understand why the Raw files for these two 16mp cameras should be so different. Anyone have any thoughts? In any event, the observed difference between the two is close enough (23MB vs 27MB) that I'll use 25MB as an average. So my maximum of 3,000 images (based on prior experience) would fit on three 32GB cards. My plan therefore would be five cards total, with nightly copies to a hard drive. I'll take a few older cards as spares just in case something bazaar happens, like I shoot too much.