I have tried full package pumping off and on for awhile. Overall my results have not been satisfactory, but that is probably because I have not done it consistently for many months.
When I have pumped my schedule was approximately 2 days on then 1 day off. I would pump at a vacuum of around 3 Hg for 20 minutes then take a break for 5 minutes. I would repeat that for a total of about 3 or 4 sets depending on my available time. I would continue this for about a month, sometimes a little longer, and then my circumstances would interfere with continuing. Then, after many months off I would try again.
When I am engaged in my schedule my results have been acceptable — testicle and scrotal sack enlargement is good, and penis girth increase is OK with a little bit of length increase. I have not noticed enough erect length increase to bother trying to measure it. I am very small (both penis length, girth, and testicle size), so the increase when I have full package pumped is welcomed.
By increased testicle size I mean the testicles themselves are bigger, not just a larger size from the accumulation of fluid in the sack. In fact, now when I pump I try to minimize the fluid buildup in the sack. There have been times in the past when I pumped to get fluid in the sack, and I would get really big, which was fun to see, but since it was just fluid the appearance of my testicles was not what I was wanting.
However, the increase in size does not last long at all for me. If I pump in the middle of the afternoon, then about 60% is gone by nighttime, and about 90% the next morning. My flaccid size seems to stay larger for a day or two afterwards.
Since I have small testicles I have tried to increase their size with as little lengthening of the scrotal sack and spermatic cord as possible. My reason is that the lengthening of the sack and cord does in fact occur and it seems to be permanent. But, if my testicles never stay bigger, then I do not want to have lower hanging small testicles because I think that would look really bad. I would not mind lower hanging balls if they were large and would stay that way.
In fact, it is this very concern of mine that has contributed to my hesitancy about continuing to full package pump. If I could find out with confidence that regular full package pumping would result in “permanently” larger testicles (not just a longer ball sack, and not a fluid filled sack) then I would be more motivated to pump consistently for many months.
So far, I have not found anyone who has reported “permanently larger” testicles here at Thunders Place or other sites. By “permanent” I mean testicles that stay large without pumping for a long time — I would consider them “permanently” larger if only a maintenance pump was needed once in awhile.
Hopefully some of this has been informative and/or helpful for you.