I just received my regular Synapse yesterday. After packing it up I was a little disappointed as to how small it was and high it rode on my back on my 6 foot frame. I may have to return it and consider a new larger Synapse, since I have a 26L pack that does fit very well on my frame. Maybe a Smart Alec will be a good larger option too, since the bulk of pack came from my windbreaker bulging it, which the Smart Alecs outside storage would solve.
The Synapse would be great with loops on the outside to add modular bungee cords to strap on a jacket if you needed them, or remove them if you dont.