Was turned onto these by my favorite FFL. They are based out of Stanwood/Camano Island area. They are hand made to order. Multiple colors and patterns available. They have "KYWI" retention or KYdex Wedge Inserts which will also fit into most other pouches if you don't want Esstac's. I've only spent a few hours shooting with them on my plate carrier and doing a tactical reload or just placing your mags in the carrier is so damn easy and easily held in place at the same time. Direct pricing is high but there are other dealers for them, even at manufacturer pricing i think these are worth it after working them.

So you just add these to your existing pouches? Have any good links of where one should buy?

You can buy just the kydex insert if you have pouches already. Looks like theres some other manufacturers that make just an insert as well (Pantel, Haley etc) This carrier of mine was empty so I opted for full pouches, Ireally like all the different options for pouches you can choose from. SKD carries them as well.