Ok, picture heavy but might help with your choice.
My appologies for my lack of photographic skill
SFA with a Berghaus Munro (40ltr) and Woolore for some scale.
Scandinavian Forest Axe with same
Both axes on a 100ltr Vulcan
That should give you some idea on pack size hopefully.
As for blade/head size for comparison we have a selection....
Both axe heads with Woodlore
Ah, a group photo
Lastly, just for some detail:
Scandi
SFA
Wildlife Hatchet
I hope this helps a little. I don't know what experience you have with axes but if you want to start off with some carving you might well consider the Wildlife Hatchet and taking either a folding or collapsable bow saw for firewood etc.
All GFB axes come with their 'Axe Book'. A really useful read. I have a few knocking about the office so if you PM your postal addy I'll send one out. Might help with the decision a bit. When you finally get your new axe just pass the book onto the next person with a quest for knowledge.
Cheers
Mike