Thanks to Paula for this Frugal Baby Tip!
Going out on a limb here, but what does using a Snappi have to do with keeping poop in? Isn't that related more to how well you fold the diaper and how well your cover holds the prefold? I, personally, hate Snappies. I don't like how they make the top of the prefold bunch out. Then the baby's clothes get tucked into the top of the cover because it's pooking out from his tummy. Give me a nice pair of old fashioned metal diaper pins any day!
Check it out:
Maybe I'm just missing it about the Snappis, or I do it wrong, but I've always gotten better results with pins. Give them a try... they aren't as scary as they seem. (though Dh is terrified he'll poke the baby, and he's got weak thumbs from repeated B-ball smashings so I keep a Snappi handy for him. But I'd still rather run in there when he's almost done changing the baby and use the pins)