Howdy folks. My sturdy Brenthaven backpack is now taking good care of my 4th 15" MBP. The bag looks as good as it did the day I bought it and I have no plans to replace it. However my new MBP is a retina and hence rattles around a fair bit in the bag as the pouch was designed originally for a 2008 model. Is anyone aware of a "sleeve down" insert I could buy which would live inside the existing pouch so the retina fits like a glove? Muchos grassy arse.