I’m enjoying the P-tanks; while being a smaller form factor than standard boro tanks they hold the same amount of eliquid. Currently I am using this with the Sturdy One rba and it’s a great combo. I get great eliquid capacity and the mod I am using with the P-tank is great… it’s the smallest setup that takes boro bridges and I love it. I do wish the o-ring on the top part was a bit better as they are critical for a perfect sealing of the tank however it’s hard to get it perfect on the first try even lubed with eliquid. But it’s a small hassle to pay for the ability to enjoy my rba’s on the go with the most pocket friendly setup to date.