I own a Vector 348 and am renting a Pilot 188 ZPX, have a PD 160 reserve. I am renting the canopy from a Master rigger who is highly regarded- he verified it was going to fit and would be safe to jump in that size container. It is a brand new canopy, I have been learning to pack with it, jumping it both with other packers packing it for me and also packing and jumping it myself a few times. There have been no problems with the bag extracting or the canopy coming out of the bag so far. Am using the original D bag that came with the V348
It was fitted with a near new Sabre2 170 that I packed for practiced a few times before getting the Pilot 188 ZPX. Feels very similar to pack into the container as that did- both are a full fit. I had to work about the same to close the container for each canopy type. Neither are fun to pack yet.
The Pilot ZPX that is brand spanking new is extremely slippery, not even close to fun to pack or bag. It is not easy for me to pack, I am slow and I take my time. And sometimes swear when packing But openings have been sweet.
Bear in mind this is just my opinion based on what I have felt and seen packing it as a less experienced skydiver, and that I took advice from a rigger that knows his stuff. UPT do say the V348 is a full fit with a LPV Pulse 190 which is also equivalent or so pack volume to a Sabre2 170.
Talk to a rigger you trust about it.
Hope this is helpful. :)