i can fit enough for my 3 in it, including 2 changes of clothes for my 2yo as we are tt. It dows fit on the maclaren although you have to make sure there is a bub/toddler in the pram or it can tip. Can't comment on whether it fits a pikkolo as i only have an ergo.

I love it and it's one of the best baby things ive bought - and i haven't even used it on my ergo yet as isla is too smal to go on my back at the mo.

Julie x