In reply to n-stacey:
Amusingly enough, I had that happen to my little 10L rucksack. I had it in the garage in my previous place and something ate through the netting to get to some sealed cereal bars I had in there. Rodents have a bloody good nose. Whatever it was, it would have been a **very** small critter, it left loads of tiny tiny nut shells and there was no opening big enough for a normal mouse, so a cute little dormouse is what I suspect. It also wasn't interested in any of the food in the larder right next to it...
Now, on topic, I would contact Equip Outdoor, who are Rab/Lowe Alpine. They have pretty good support.
Post edited at 14:35