The Polish WZ89 army backpack (aka Frog or Puma camouflage) is a cheap and simple backpack. Just a big sack with two straps on it. It was in use in the Polish army from 1989 and until 1993. The typical camouflage pattern is called the Zába Pattern, which in polish for Frog. On military surplus store websites it is also called the Polish Puma camouflage pattern.
The bottom is protected with a rubber (PVC) coating. So when you place your bag in a small puddle of water or in some wet grass not all your stuff is totally soaked. For a better protection it is wise to use a big plastic bag inside the backpack itself since the fabric is very thin and not very water resistant. In military surplus stores you can also buy special water resistant laundry bags.
The top side of the pack has two drawstrings, one on the very top and one a bit lower down the body. The lower drawstring allows for loading to regular capacity, similar to a normal rucksack. The top drawstring allows you to expand (overload) the pack to the size of a big backpack. Keep in mind that there is no padding on the shoulder straps. So if you you load up on weight it’s going to cut into your shoulders and may hurt. The big top flap can be closed in two different heights; two triglides on the bottom or two triglides half way the pack.
The rucksack is constructed of very flexible material and doesn’t have a rigid frame. This simple construction gives very little wearing comfort. However this also makes it ideal for packing and compressing your luggage down to a small package and in the same time it also allows you to expand the bag to carry a much larger load. It is also possible to fold the bag down and take it with you as an extra bag in your main luggage. Since the weight of the pack is only 0,75 Kg it is not that much extra.
Other comparable designs.
There is also an improved version of this backpack with a different camouflage pattern (WZ93 Pantera) and stronger materials. The M93 Pantera camouflage backpack. The fabric of the M93 backpack is waterproof and the name tag is stronger and equipped with a better plastic window.
The much bigger and heavier French F1 65 liter military backpack might have been the inspiration for this design. That bag is also more like a duffel bag, comes also with a rubberised bottom, and is also closable at two different heights. But that bag is made of much heavier canvas and the rubber is thicker and comes higher from the ground. This makes the weight of this pack going up to 2,15 Kg. The backside of the pack has a padded back support in a triangle form, the shoulder straps are padded and the pack has a simple belt to let the weight rest at your hips. These features makes this backpack / duffel bag quite comfortable to wear. More info in this special blog about the French army F1 backpack.
Many people regard a soft backpack without any back support or padded shoulder straps as a ridiculous idea and the worst design ever. However the famous (military) backpack company Berghaus made a similar backpack The Berghaus MMPS Grab Bag. This bag has also one main compartment without side pouches. Only the cover lid is a little more sophisticated with a pouch behind a zipper and some webbing for attaching extra gear. This bag is also meant as an extra light weight bag that you can take with you in your main luggage.
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WZ89 Polish army backpack frog (Puma) camouflage in military surplus store:
www.anchorsupplies.com British army surplus shop
www.armyworld.pl Polish military shop