My favourites items of kit are in the original form,they have inspired copys,some of the copys are better,but these items got the ball rolling:
The SAS Windproof smock: great item,hooded,lightweight,big pockets.
The US Army water bottle:,mug,and burner,great idea,all in a pouch with a small pocket for the water puri. tablets.
German Army Boots;what ever version they sem to be well made and much better quality,the current Mountain Boots are from Lowa.
The Aussie shelter/basha:now modified in many versions.
The Swiss Army Knife
do they get issued with these!??)
The British army pocket survival kit: not really an issue item ,more of a concept.Something the individual has to put together himself. I have never come across another army that carrys anything like this.
The Swedish Army Fjelldukken(hope the spelling is right!):a sort of poncho,sleeping/bivi bag,can be zipped with others together:a impressive bit of kit,no bigger than a poncho.