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I once made a perfect replica of a USD Cam-EZ-Pak which originally was a black plastic moulded back pack very similar to the one shown, except it didn’t have the carry handle on top. Voit made an identical pack except they used their Voit blue.
Several years ago a buddy of mine broke his USD pack pack during a dive we did. He loved that pack and was very sad that it broke. So I took all the pieces home to my shop and crazy glued all of them back together to form up the pack again. Then I casted a mould from the pack, then casted the part (new pack) out of hand layed-up fiberglass and had a perfectly replicated backpack that was an exact copy of the original.
As far as I know he’s still using it and fiberglass is a lot stronger than plastic. It should be around for many years.
Perhaps someone replicated the orange pack you have? When I made mine I made a black one for my buddy and a bright yellow one for myself.