I've managed to get my hands on a few of these http://www.podsacs.com/accessories_beltsbuckles.html , the 50mm accessory belt,they are perfect for strapping the larger Alpkit drybags as they adjust from 550mm to 1 metre in length and have a really strong clip. They are brand new in their original packaging and provided you are in the UK, I'll include postage for £10 a pair. E mail is in profile, sorry don't do Paypal.