Please do, as I'm really nervous....
Test #1. Well from my test it seems completely random what you lose and how much of it. Was carrying around 43/48 things and after falling in strongest trail I came out with 39/48 things.
Test #2. Again not like I expected...went in with 39/48 and fell then came out with 35/48.
So it may just be I'm too lucky tonight and just not using too much or that I'm carrying around most junk items like unused multiples of berries/bands/ribbons....but it's not too much of items lost for me in Strongest Trails after those tests.