My Filson bag is probably 7 times bigger or more than the std FatBoy. Really no comparison at all on these two. I can easily carry 25 pounds of junk in the Filson....while I find the standard FatBoy almost too small for anything I do. I was very dissapointed that the side pouch on the std fatboy only has a one way zip...my ham radio with antenna will not ride there securely. The little flap holder will take a matchcase and FireSteel but I cannot imagine what else could possibly fit in that tiny pocket.

I love the construction and the hang of the fatboy, but it is just too tiny for me.

The jumbo fatboy looks much better to me as I think it will be about the size I want. The water bottle is probably the most important change...stick 1L in the std fatboy and forget anything else except some very small stuff.

The jumbobag should take, camera, water, sandwich, garbage bag, bird book, ham radio and a bunch of small stuff without any difficulty.

I want my camera easily accesible in a bag rather than squeezed in so tight it cannot be removed.

The Filson bag is too big for these sorts of outings and it does not ride like the fatboy. My Billingham Hadley bag is near perfect in size but again it does not ride like the fatboy and I have one central compartment where all the junk sort of bunches together.

I may actually need a super jumbo fatboy to be happy <img src="/images/graemlins/smile.gif" alt="" /> That is the reason I hesitate spending the $70 on the jumbo.