The Phil & Ted strollers with doubles kits are awesome for two kids. However when you use the double kit it takes away easy access to storage when the 2nd babe is little and then as the child grows bigger any real storage at all goes away(as they fill the basket with their legs and feet).
The Blazing Saddle Bags (Pannier) easily fix the lack of storage.
They do add a little more width to the stroller when installed but it's well worth the additional storage. I plan on keeping on bag full of emergency supplies (diaper, wipes, blanket, change of clothes etc) and the other bag with stuff we grab for whatever adventure we are currently on.
The bags clip off easily so you can bring them with you if you park the stroller.
We have also folded our stroller down with the bags on, but our bags aren't stuffed full either so that might make a difference. In any event, they are super easy to remove anyway and then reinstall when you are ready to go again.
I highly recommend these bags if you are going to use your Phil & Ted for two kids!