Iain.......
WTF?!!?!
You have probably accounted for 90% of all the Orvis strap on luggage sales from my shop this year, you need more?!
I have a Tac L Pac and th Battenkill mesh vest, I prefer the latter. Lighter and is much cooler in the summer, not as much support as the Tac L Pac if you load it up full but, for me, that is a good thing as it encourages me to take only what I need with me.
Cheers
Ben