As a follow up to this question, would a trifold pamphlet be ok? Since four A4 pages is a two sided piece of letter paper, a pamphlet is about the same size I believe. I know the Appx N Jam allowed that.
Viewing post in Obligatory jam page limit question!
Short answer: Yes that's fine.
Long answer: Some of the details can be a bit confusing because of the differences between US and Euro sizes. And technically a trifold isn't a size, it's a format ;)
But I'm assuming you mean a letter-sized trifold (the size most Mothership trifolds are).
Letter is slightly smaller than A4. So you could submit two letter-sized trifolds and still be below the submission limit.
If you want to be really sure, just make it an A4 trifold rather than a letter-sized trifold.
I hope that wasn't confusing!