Ordinarily when it comes to rucksacks, you have to compromise on something. Either your back size limits your options, or the adjustable straps don't adjust far enough, or else there aren't big enough pockets for all your gadgets- ahem- hi-tech walking aids. However, the Freeflow IV seems to have addressed all these issues.
The back system is great year-round, and the space between mesh and rucksack can be used to stow a scarf when you're halfway up a scramble and can't stop for a gear change.
The shoulder straps are comfy and easy to adjust, and don't feel like strips of lead binding you to your pack, as can happen with other rucksacks which shall remain nameless.
Building on the success of the Freeflow I-III, this rucksack seems to have evolved, not been made, into a leaner, sleeker bag than its predecessors.
The only drawback with the back system is the distribution of weight in the main compartment. If, like me, you've always just bunged everything into your pack and ran off to the nearest hill you'll need to think again: The heaviest things need to be at the bottom and top, with everything else in the middle, else you'll be in mortal danger of falling over backwards in a strong wind.
However, as long as you use a bit of common when packing, this is the best backpack ever. Mine has traipsed through 7 countries on an epic 2000 mile interrail journey across Europe, containing everything I needed for three weeks, and has also camped on the North York moors with nary a problem.
Later this summer, the Freeflow IV will be hitting the Pennine Bridleway.
Overall, it is a versatile, comfortable and useful rucksack, and well worth the money.
(Written by: Torrie)