It is my side by side beer fridge.  I will mess with my freezer adjustments to see if I can get it colder.  I also moved from the top shelf to the bottom shelf.  Usually a good 5-10 degrees colder there.  When it does the defrost cycle, it blows warm air at the top shelf.
 
The juice bottle that I used is mostly ice, but not completely frozen, about half way down.  That one is usually solid with regular water.  I have a feeling that I used too much salt for the strength of my freezer.  
 
Will report back tomorrow, hopefully with rock hard ice packs!
 

I guess if too much salt, I can saw in half, less salty water and use couplings to reconnect.
 

Porktown
I guess if too much salt, I can saw in half, less salty water and use couplings to reconnect.
 

Drill with a 5/16ths or 3/8ths bit, drain, refill using a syringe or tubing (like oxygen tube on fish tank aerator) and funnel. Plug hole with a short bolt and JB weld. 

Now, if you would only out this much effort into developing a vaccine for covid....all would be right in the world!

The funny thing is, people seem to think there are thousands of scientists working on vaccines that somehow aren’t putting this much time into it. Building these things are like a water break for them. Us internet scientist need to stick to freezing saltwater...

To heck with cooler bags, freezing water and beaches. I been watching National Geographics 🦈Shark Attacks.... 😳screw salt water fishing. Stupid fish.


Try little salt and only fill your pipe 80 to 90 % to allow for expansion.


Also, maybe cause your prepping your cooler bag for the beaches... you should be using sea salt? 🙉


bye.

Porktown
So, I made some of the PVC ice tubes (2" pipe).  I did them 9" long each (seemed to be a good length for all of my coolers).  Used 2 cups of salt to 1 gallon of water ratio (2 tablespoons per cup).  6 tubes ended up using 1/2 gallon.  Other half gallon went into an old juice bottle that I was already using as an ice pack with regular water.  Each tube was filled about 80%.  Wow, did PVC end caps go up in price???  Over $2 per.  I had to go to both Lowes and Home Depot to make sure one wasn't just mispriced...  6 tubes, including the cement and tube which I have a bunch left over and some white spray paint to make them look a little nicer, was over $45.
 
I did some tests and have to say that I am extremely disappointed.  Hoping the results were just a flawed initial test.
 
When I have used the juice bottle in my cooler (using regular tap water), it will stay mostly ice for a day.  2 days it is about 1/2 ice and after 3 days, it is usually melted.  In a Yeti soft cooler, so the cooler is pretty insulated.
 
I put all 6 of these PVC packs in my cooler.  The next day, my temp gun was reading 65 degrees in my cooler.  Each pack was about that same temp as well.  This was sitting in my basement that stays about 72 degrees...  Maybe 12 hours.  One thing to note, the ice packs were 18 degrees when I put them in the cooler, so they start off initially colder than ice.  They were kind of semi slushy/solid.  Had been in my freezer for 2 days.
 
My initial response right now is that these these are a huge waste of time and money and shocked of how poorly they worked...  I hope my initial testing was flawed somehow though, maybe need to be in the freezer for longer?  I know the regular ice pack as noted, is a full half gallon in itself, so slower to melt a larger block rather than smaller blocks.  Usually when I put that ice pack in, I have some already cold beers keeping temps lower too.  
 
My next test will be using my new cheaper fishing cooler back pack.  I really only need them to last for 3-4 hours.  It would be nice for longer, but usually is all that I am out for while at the beach.  Then hit the house/condo and back at it in the evening for another 3-4 hours.
 
 

 
I generally don't read your posts, because  they're usually much too long, and wordy. But look up the definition of latent heat, it's a Trump thing.

Test 2 is under way.  Using 1 rather slushy pack.  It has my fishing cooler bag maintaining about 50 degrees, with my BBQ temp probe lifted about 3" from the ice pack.  It was registering 25 degrees next to it, but I think ambient temp would be more important for keeping some fish in it?
 
Packs were hard last night, then slush this morning.  I think my defrost cycle is keeping them from staying solid.  I imagine it would be similar for a fridge at a rental property too.  I'll see how these perform, but I have a feeling that I will be draining this weekend.  I had 2 cups of salt and 14 cups of water (in a 1 gallon jug).  That would put me around 14% saline with roughly 14F freezing point.  My temp gauge had my freezer at -2F, so peak freezing seems to be fine, but defrost cycle I assume is messing things up.  They seem to take forever to freeze as compared to regular ice too, so I think that I need to cut the salt in half.  I want something that I can put in at night and be frozen in the morning, which I imagine is straight fresh water.  I am going to do a few different ratios in some of my throw away containers.  Something that I should have thought of before capping, but was too excited...
 
I don't have any JB Weld and not sure if I want to test any glue that I have laying around to be water/ice tight.  Couplings are 70 cents each and I have more glue.  Might even buy two more caps to make some longer versions for my bigger coolers.  I am going to use Fisherlady's suggestion of drilling a hole (2), to drain, then chop saw, so I don't end up in the ER.  Or have to use one of those metal things that you have to pull back and forth that doesn't plug into the wall and make a cool sound.
 
Once they start working, they sound worth it (especially if not a moron like myself taking multiple attempts).  

I got 4 hours of pretty consistent readings in my bag between 50-55.  Bag is in my office where it is 76 degrees and not in the sun.  Pack is currently liquid, but condensation ice on bottom side of pack, so still cold.  I would imagine if outside, it would be warm by now.  I think two packs would have me where I want to be.

Pork if it's worth anything to you. Youtube experts recommend filling the tubes to 90% with straight water.