Velcro chuffs, not worried, but alert in that oddly intelligent way some wizarding pets develop when their owners truly care for them. Sebastian smiles again, ruffles his ears and then reaches for his CiD to check the time and send a quick note. If Severus is close enough, he's welcome to read the text to Malfoy:
    

Once the message has been sent, he packs away the CiD but leaves the bag on his lap. His rucksack (http://www.polyvore.com/all_time_is_unredeemable/set?id=27596471) is a simple affair, with a single strap and easy-pull zippers that is ideal for someone with an injured hand. While it serves as an adaptive living device, it was originally designed as a rucksack to hold a handgun (which he no longer carries) and to allow quick access to a sniper's kit.