This is a field canteen used by the Finnish Defence Forces during the 1980s. It is made out of steel, available in both dull and shiny finish, with nylon pouch. The cap can be seperated from the pouch to be used with the flask. The bottles with shiny finish seems to be a bit taller than the dull ones, about a centimeter or so. However they both fit to the same pouch. The shiny bottles will hold 0.75 l of liquid. All the bottles I have weight exactly 346 grams, while the pouches weight also exactly 152 g. The combination will thus weight 498 grams or 17.6 oz.
The flask will not stand by itself as there is a welding seam running both inside and outside the container. However it will stand with the pouch on. The pouch is closed with two snap fasteners. The cloth is 3,6 mm thick at the flaps as there are some padding placed there and 1,6 mm on other places.
I made a little test to found out if these bottles keep liquid colder/hotter than the little larger current issue PE-HD bottle. A steel flask with pouch (no. 1), a steel flask without the pouch (no. 3) and the current issue bottle (no. 3) were each filled up with 11 C water. They were left to stand out in a shade and the temperature of the water was measured after each hour. The outside temperature ranged from 21 to 23.5 C and wind blew few meters per second during the whole test. 0.5 dl of water were removed after each hour to simulate the user drinking the water.
After three hours no. 1 showed 16.3 C, no. 2 18.6 C and no. 3 19.5 C. Interesting enough the plastic bottle had smaller insulative factor than the steel one! However the larger size might have been one factor that would explain the difference. Changing the pouch to e.g. a wool one would perhaps boost up the efficiency a little bit.
The flask will not stand by itself as there is a welding seam running both inside and outside the container. However it will stand with the pouch on. The pouch is closed with two snap fasteners. The cloth is 3,6 mm thick at the flaps as there are some padding placed there and 1,6 mm on other places.
I made a little test to found out if these bottles keep liquid colder/hotter than the little larger current issue PE-HD bottle. A steel flask with pouch (no. 1), a steel flask without the pouch (no. 3) and the current issue bottle (no. 3) were each filled up with 11 C water. They were left to stand out in a shade and the temperature of the water was measured after each hour. The outside temperature ranged from 21 to 23.5 C and wind blew few meters per second during the whole test. 0.5 dl of water were removed after each hour to simulate the user drinking the water.
After three hours no. 1 showed 16.3 C, no. 2 18.6 C and no. 3 19.5 C. Interesting enough the plastic bottle had smaller insulative factor than the steel one! However the larger size might have been one factor that would explain the difference. Changing the pouch to e.g. a wool one would perhaps boost up the efficiency a little bit.
