We are packing up the house to move and I brought it up again. "Hey, the diapers would make great packing material!" We have dozens of flats (and some prefolds, fitteds and FB that we have bad luck washing and mess with the 9 month old's skin - they're all being stripped and passed on) that are going to cushion our breakables. Hurray!
The compromise is that we will have two dozen pairs of non-waterproof trainers and half a dozen waterproof covers for when DP takes them out alone.
So far today we've had a wet and the start of a poo for each boy. Not bad at all.
Is your question about how to convince your partner? Is he afraid that your boys might make a mess in public space?
My son started wearing underpants full time in and out at 12 months although he had some accidents. We used to go out just to the park or to the supermarket for a short time, so it wasn't a big deal, but I decided to take him to a baby music class when he was 18 months and I was nervous because I was afraid that he might make a mess in the classroom. We had only occasional misses by that time, but he was not yet communicating with me verbally. I made sure that I take him to the bathroom as soon as we got to the class. He peed most times unless he really didn't need to. I became more and more confident about going out with him in underpants and we joined a playgroup which had 4 hour-long playdates when he was 21 months.
I think your partner will feel secure if he makes sure to take the boys to the bathroom as soon as they get to places where they CANNOT have accidents. (class, friend's house, restaurant, etc.) and offer toilet breaks consistently.
cotton underpants for diaper-free babies 3 months and up
Yesterday I only had the 16 month old at grandma's and the old house, so I recorded his every pee out of curiosity. We got up an hour early for an appointment, instead of his morning nursing, he woke up laughing about the big dog on the bed.
He peed in his nighttime diaper after we got out of bed but before we made it to the toilet.
We made it to the appointment a little early, pee in the pot. 8 am.
There was a break at 10, another pee in the pot.
At 12, an offer and a decline.
At 12:50, he was more than ready for a nap so I didn't even offer, miss.
At 2, he was a little tyrant still, so he went in his pants but finally went to sleep after I changed him.
He slept until 3:15, he was wet by the time the kids brought him to me (we were on different floors).
At 4:30 he declined my offer.
At 5 he wet while everyone was packing.
At 7:15, he declined my offer before our 1.5 hour car ride. He fell asleep in the first 5 miles and stayed dry until he wet his diaper at 6:30 this morning.
7:30, normal wake up time, he nursed, sat up, grabbed his diaper and said "boo!" So he pooped and peed in the toilet.
Little brother was up 10 minutes later and followed suit.