Closed Cell Sleeping Pad in ULA Circuit

Whats the concern? fold it flat and stick it in there. Now if you want to use it instead of stays, thats a different story. Whether or not it fits depends on your other gear and how much food you have.

I just wanted to know what others had experienced using different pads as not all pads pack the same.

I use inflatables so I am only guessing here…
The Circuit tapers from the top to the bottom (the top is wider) so having the mat (like a blue mat) opened up against the wall may cause you to lose some extra space.
(by not fitting exactly against the wall)
The thinner mats (GG ThinLight) should fit better.
A folding type mat like the Z Lite (R size)is about 8 L in volume so about 20% of the inside of your pack without the extension, but that may rob you of less unusable space .
Franco

I use a 3/4 ridgerest in my circuit, and although it does cut down on volume, I don;t mind because (A) it improves compression and carry quite a bit, and (:)

Ive used ridgerest, GG torsolites inside the circuit. Its just a matter of volume of your food and gear. Under 4-5 days food, if you are really UL with a compressible down bag, it should all fit. Because the bottom tapers , folding and putting flat against the back panel works best, you can get the pad all the way to the bottom of the pack.