I too am always on the lookout for a big backpack, my present Thule one is excellent for summer and the battery storage compartment keeps my sandwiches from getting squashed, however, for big winter days I need room for a flask and heavy duty survival bag. My ancient Camelbak may have to come back into service but I could really do with a new one. The Deuter Trans Alpine 32 EL above looks interesting but when I go on the Deuter website it states it’s no longer available! Have you been sent old stock?
perhaps ignore the above! I’ve been on a different Deuter.com website and it’s available, weird!