Obviously it's not going to stop someone with full bolt croppers, but 2m of 3mm stainless wire rope is about 70-80g, plus a small luggage lock and it'll roll up small enough to be packed just about anywhere. Going upto 5mm wire is about 190g. I think I'm going to get one for my upcoming tour, it's certainly a lot better than going without.
Also, for those asking about cheap/small/light locks a few pages back;
https://www.ebay.co.uk/itm/3mm-7x19-Stainless-Steel-Wire-Rope-SOFT-EYE-Sling-Strop-Fabrication-2-Meter/253276186741?epid=18005535045&hash=item3af86fe875:g:HnoAAOSwWdZZa7gy
Obviously it's not going to stop someone with full bolt croppers, but 2m of 3mm stainless wire rope is about 70-80g, plus a small luggage lock and it'll roll up small enough to be packed just about anywhere. Going upto 5mm wire is about 190g. I think I'm going to get one for my upcoming tour, it's certainly a lot better than going without.