Marina - rubber straps disintegrate

Bag was a present, got it about a year ago.
It ́s the best I ever got. As a tour guide I need my stuff in a dry place and prefer a bag that doesn't slide off my shoulder with any monument I explain. Marina was my bag.
Now the rubber straps fall apart and can't find anything to replace them.
Are there any spare parts left in anywhere? Or any idea how repair?
I need my marina!
Cheers,
Doris
 
sad I’m sad
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