you're right, you are a complete tard
in the centre of the lid you will notice a small rubber bung, when the pressure gets to much the removal of the lid is nigh on impossible. unscrew 2nd lid, push down on small bung and WOLLAH you can uncrew the lid
in short it acts as a pressure vacuum release valve cover.
nothing wrong with keeping it in your ammo pouch, i keep mine there. along with mars bars, don carry ammo its way to dangerous
Bit off topic, but I've had a flashback
Whilst with 47 Field Regt a well known collecter of other peoples throwaways found a flattened aladdin flask in a skip in BATUS.....it had been run over by an abbot.
The gypo sent it back to Alladin and tried to claim a replacement, as it should have been unbreakable!
Is the top disk metal and the second lid plastic? Does the second lid indent bu about 5-10mm and have a little knob in the center? if it does that little knob is the bung Northern monkey was talking about.
Hmm, them Aladdin flasks are a good bit of kit. Bought four in 1980 for Â£7.50 each, kept two, gave one to my dad and flogged the other for Â£15. My two are still in good perfect working order. Good investment.