fear not they are ment to be flimsy!
they are an upgrade of the standard waterbottle of the 1960's throught the vietnam period and through the cold war!
it's a 2 quart waterbottle,
often carried as well as standard bottles on the outside of an ALICE (all purpose load carrying equipment)rucksack/pack, 2 or more were carried!
i've seen photo's of 2, 2 quart water bottles on 1 set of webbing!
you'll probably see the same in the 1st gulf war photos though camel backs are the done thing today!
by the catch you must mean the front black clip,
this is the standard clip found on Alice webbing ammo pouches, and on a lesser known webbing known as MLCE(modernised load carrying equipment) or M1967.
MLCEis a Nylon version of the vietnam M1956 webbing or LCE(load carrying equipment)
the webbing was only used for a short time, and made of Nylon to help guard against the tropical rain and constant humidity that rotted canvas, as i say these black clips were on all of the parts of the webbing!
MLCE is the forrunner of ALICE and parts are still used today.
i used Alice webbing for several years in and out of the TA and the clips never even came close to breaking!
you should also have 2 metle sliding belt clips on the rear of the pouch called "Keepers".
the bottle is colapsible, thus saving space in your rucksack!
other uses i have heard of if empty are, a floatation device, and a pillow!
you may not know this but there is a metal mug that you can buy that will fit in the carrier with the bottle! a sort of wierd square shaped one!
the idea of the fleece in the carrier is that in cold conditions it stops the water freezing and in hot conditions you're ment to soak the carrier and the water will evaporate keeping the bottle cool!
also there is a shoulders strap to carry it to/from a water source if filling up many at a time!
a neat idea, shame there isn't a crusader cup version of the cover!
without seeing it with my own eyes i can't tell you if it's fake, chances are it is a copy but if it does the job i woulden't worry to much!
hope that's not too much info, i just used to collect various kit so i have a fair knowledge about kit!