Thanks for the comments. Yes I really enjoy hiking with him, he's very calm and never goes further than a couple meters from me, a great companion. As for the weather down here, well its quite nice, mornings can be misty and windy but at this time of year its quite nice. Regarding the Ruffwear pack, at the beginig when Id just put it on him to see how it woud fit and stuff he wasnt too enthousiastic, also the two other smaller dogs tend to play with it (thats why I usualy just take Chubbs on hikes) I also get the feeling he doesn't mind at all being away from the two for a couple of hours or days! Lately every time I put the pack on him We go for some sort of hike so he's associating wearing the pack with a nice hike. I get the feeling he quite likes it now! Tomorrow I'll be going for another hike and he will be carrying 4kg of water again. Ill take pictures of different parts of the path and Il hopefully get a bit higher as well.
Cheers
Wouter