Last year i bought myself and friend a 500ml bottle each. I had never heard of Sho and I have to admit, expectations were low as we headed up that first mountain armed with our hot drinks... As beautiful as they are, would the contents still be hot after 8 hours (and in the winter)? The coffee & hot chocolate was scorching, we were so surprised at how efficient they are! This year, 2 food flasks were purchased, filled with cullen skink and we headed up another snowy mountain. They are quite large for hill climbers (about 1 litre...?) but again, they lived up to their word! Thank you Sho for providing me with the last 2 years Xmas presents, now, when are lunch boxes coming out...? :)