I was doing some idle web searching for lightweight alternatives to carrying a sleeping bag, tent, and waterproofs and came across the Ecotat Tent Multipurpose (TMP) and Lightweight sleeping bag multipurpose (LWSB-MP). Items described at Ecotat. I quite like the idea of these since they can apparently fit easily into a "buttpack" or probably half of your lower rucksack compartment which is a lot smaller than the total space required for the items replaced.

Has anybody used these items and got any comments on them or have any other suggestions for similar weight/bulk saving items?

Cheers,
Stephen.