I've used sposies with Evie a few times as we've been to-ing and fro-ing with DH's work and I haven't been organised.
(he's been working in a hosp 2 hours from here so usually stays up there and we often go up to join him)
I've had a poo leak with Evie EVERY single time! And never in cloth so far!
The worst was when I'd just fed her and was winding her - it leaked up the back, out of the nappy, onto her clothes, my trousers, the feeding cushion, and the throw covering the sofa...