You should put him back in diapers (with tapes) instead of underpants, They can hold more urine than pull-ups. If you fit the diaper snug around his waist and his legs, it will not leak. Another option : you put plastic pants over his underpants.
How old is he? Unfortunately, you have to be patient. He will outgrow his bedwetting one day.

Have you thought of using a bed pad? A good quality one he can lie on directly and any leaks should be contained protecting your sheets. If he can be persuaded a diaper and plastic pants would also help as Mom KATE has suggested. That’s what I use and I don’t often leak so now have the confidence to put the bed pad under the sheets to protect the mattress just in case.
I hope you find a good compromise that works for both of you, and please let us know how you get on. Good luck.

He's 8. Not sure if rubber pants come in his size. We buy the Target brand of Underjams and they usually work well as long as we tightly restrict liquid intake. I guess we could try diapers, but again not sure if we can find his size. Thanks for some ideas to think about. ;)

I’ve been dealing with wetting for a while with my daughter and have the same issue with the Pull Up type products leaking. At 8 is a tough spot because they are in that in between size, but I hope you find something. My daughter was always small (and had some medical issues) so diapers worked, but it wouldn’t work for everyone.

You can certainly find diapers and plastic pants in his size (unless you live in the middle of nowhere, do you?).
Is he too big for baby diapers? Then, try to find youth diapers. Restricting liquid intake is not a good option in my opinion.

I agree with Mom Kate diapers will be your best option. Plus Ritchie also made a good point also with the bed pad. You can use the goodnite bed mats on his bed also, I myself use these on my bed to help with leaks during the night.
I usually get my diapers from diaper buys in Michigan or I have ordered thru northshore both of these companies will help you choose the right product.
I have been back in diapers for night bedwetting due to an accident a few years now. Finding the right product was hard at first, but I'm sure you will. Keep your chin up with positive thoughts.

I know you may be at your wits end with all of this, and I just would like to say that I was 8 as well when I had to start wearing diapers and I’ve had to wear them to bed now for 19 years. I more or less have to accept wearing them now, and at times it really gets to me needing to wear them. But probably the hardest years were as I was growing up, especially when I was first put back in them at 8. He can’t help it, and your support and love i’d imagine is very important for him right now.
I really hope things improve for you and I’m sure he’ll get dry again soon.

I really appreciate all the awesome comments. As far as restricting his fluid intake, we only did so with his doctor's advice. Our son drinks plenty of fluids throughout the day. I will start looking for a diaper that will fit him. I just hope they don't cost more than the pull-up type pants we've been buying. Can't really afford to pay much more than we already do. I will certainly keep everyone up to date. ;)

Wish you the best of luck. I know it’s a challenge. Always willing to talk to help out, just ask.

I agree diapers usually work better than pull-ups. I tried adult pull-ups when I started again and I might of not been wearing anything they leaked so bad and my son use to pee through pull-ups so we used diapers on him until he was five and stopped wetting the bed.. also my sister in law used pampers on my niece at night until she was 9 or 10 for the same thing plus she had two boys under five that wet also so she didn't have to buy girls and boys goodnites/pull-ups whiched saved money. You would be surprised how big they fit, Diapers are cheaper than pull-ups anyways. If you need to go with youth shop around, most places have free samples you can try to see what works the best for your son

You're definitely not alone, my son just turned 11 this month and is still wetting his bed every few nights! He's seen his pediatrician and a urologist for it, and fortunately nothing is medically wrong, but it is frustrating for us both.
We use pullups for him but have the same problem with them leaking some nights so we've been thinking of switching him to diapers for night also

I really feel so much sympathy for children struggling not to wet the bed at night, I was hit by a car when I was 8 and was left with incontinence, bedwetting being a part of it, and was put back in diapers and have had to wear them to bed ever since, but the most distressing times were as I was growing up. I know my parents didn’t have any choice, but that didn’t make it any easier.
Many kids do outgrow their bedwetting, and my hopes are with you and your son that he will be one of them. At 11 years old it’s not fair that he and you have to work through this, and I really hope things work out for you both.

Hi,
I have good news, bad news. First a little research on your part. Dr. Hodges, It's no accident. Don't take my word for it.
Now the good news bad news. Most young children and even some older children who have had all other medical conditions ruled out are wetting the bed because their rectum is full of stool, pressing against the bladder. Good news, most of these children will stop wetting the bed in a few weeks with a nightly enema. Sorry!! that's the bad new. Eeeuw!
We have been there. I have 14yr boy and 10yr girl, married to father with 12yr boy and 9 yr girl. Three of these children were bed wetters. The 12yr boy is currently still bedwetting and getting an enema of 20 oz warm water to hold for 10 to 20 minutes then go to toilet. the other two children no longer wet. All of these four are not good regular poopers although they don't seem to suffer painful constipation signs, hence they do all still get an enema from time to time just to keep in step with good bowel habits.
This post will meet with a lot of criticism but our kids although they don't like enemas love being dry at night and the one who is still wetting has shown progress as he has only been having the enemas for two weeks now. Best.

I wouldn't ever criticize anyone, so I don't have any criticism for your idea, I'm just not sure that's what the issue is with my son, his pediatrician didn't mention anything about that as being a possible cause for his bedwetting

Also Ritchie, thank you for your kind words