How do these envelope style bags work vs the typical round bottom style that you see from most "traditional" retailers, ie Granite Gear, OR, Sea2Summit, etc?
I may be completely off base, but it seems like the envelope style would not fill up space as cleanly as a typical round bottom? Seems like there would always be a bit of a "pointed end" effect? And how does the volume compare - ie would a 12x24 flat vs round - I assume the flat will have loss volume?
Was looking at the ditty kit just have never used the flat style before...and so, not having tried this style, I may be completely wrong - can anyone post a pic of a stuffed envelope style dry bag? What size is comparable to say a 15L or 20L round drysack?