Don't ask me! I did all the laundry in the house today... and now have 1 1/2 loads waiting.

I HATE
I bought the lightweight, water resistant nylon jackets last year for the kids... Wynn and I already had some. They are not as hot as those nasty, sticky ponchos.

We just roll them up in the back pocket of the backpack, and take them everyday. I bought mine on eBay, but saw some in Sam's a few weeks ago. We bring our comfy stroller with the huge basket underneath to keep the backpack and junk in. I also bought a shower curtain (DM or TNmomof4 suggested it, I think) to spread over the stroller during the storms. Wynn got some clamps to hook it on tightly.
We learned the hard way to always have something to cover the stroller in the rain. The little ones hate riding around in a soaking wet stroller. We just normally have an extra dollar store poncho with us. My husband just rips it open to cover the stroller... I swear we are the "Cheapo" family though and through.