Hi
So sorry that Charlie is poorly, I hope he is better soon. Mine swallowed a pair of latex gloves - whole

- when he was about 8 months old. I went into panic mode but a visit to the vets reassured me that the gloves werent toxic and because they were rubbery would pass through his system with no problems.Im pleased to say they were right although it was very odd seeing the fingers of gloves in his poo :D
As he has thrown a lot of it up and it was shredded into small pieces I would be more concerned about the toxins it contains more than I would a blockage - not that a blockage is out of the question - but that would be my way of thinking, but as with my experience a swift visit to the vets will at the very least put your mind at rest. In fact, I would call the vet now and ask if it is likely to be toxic or cause a blockage, Im sure your vet will be happy to advise you over the telephone.
Let us know how you get on.
Caroline x