I used the smallest pockets AARN sells….in theory 185g for a pair and holding only 5 liters (+1 externally) nominally for my daughters pack of course. I added a second midline clip, carabiners and the hipbelt-holster hence 265g in total.
The hope was occasional use on longer hikes without destroying my pack.
The clip in point for the belt adapter is low so the adapter does spin on the belt. It may not be so easily with a better hip belt. For fun I tried it on a old osprey talon as it looks designed to fit a two 20mm strap hip belt (hence the bit of velcro in the middle of the adapter). It fits but the Osprey belt clip connects via a 25mm tape buckle rather than 40mm so it spins and fails. The ULA pack I saw last week would similarly fail without modifying the pack.

The belt mount slides on the MLD shaped belt is luckily held by the foam expanding.
His larger pockets have stabilizer straps but this size seems to have avoided them. The alloy strut runs diagonally across the back of the pocket. The two midline corners of the pouch attach to the other pouch the other corners to the shoulder strap daisy chain and the hip belt. It is thus fairly stable perhaps as it is easy to filled.
This pouch is about 11 by 5.5 inches …..so will sit about 11 inches above the hip belt. A 1.25 litre PET bottle is 11 inches high so the zipper closes but it is awkward to pack around (as the pouch is contoured slightly)

The alloy strut is pre-bent away from your chest to allow some air flow.

His video has him fitting two 6 liter pockets but as my aim is getting mass out of the unframed pack I sourced the two 2.5 litre bags. (The MLD exodus as rear 5 liter pocket if they were ever a real problem.)
He sells lots of fun stuff but I didn’t need to carry padding…or waterproofing…or extra volume
Unfortunately his cuben stuff is still “back ordered indefinitely”. Below has a 7.5 litre pouch which stays off the body but is probably still a bit in the way
