I tend to use the old Goruck shadow pockets to stash my gear into for then swapping modularly between bags. but they seem to have gotten rid of them (along with half their lineup).
This is what they were like:

Anyone have an alternative to the old Shadow pocket? Something in 500D+ and with a good zip (tried a few local options, Kathmandu cells etc, and they inevitably break).

What is out there now?