Folded flat, the guide lid is about 2/3 the length of the native but slightly wider than the native. I'm going on a trip this weekend I'm planning filming a comparison to post up next week. The native is a much more versatile stand alone pack than the guide imo, with being able to attach more than one pocket or a long pocket to the back. I think one of the biggest things people were wanting was the ability to put their water bladder in that approach pack, which the guide couldn't really do. Something I'm excited about with it is using it as a glassing pack near camp. I can fit my spotter, tripod, puffy, possibles pullout, etc then headlamp, map, food etc in a pocket on the back, and really have the essentials. The guide lid I just can't really do that, at least as well. Aron explains it simply as if you just want a lid roll with the guide, but if you want that glassing/fishing/approach type addition that can be carried as a lid, go with the Native.
Hopefully I can explain it in the video better than this post. Haha.
You don't find the Native to be overly big on a pack like the Fulcrum which is already large?