Italian Army Linen Small Backpack

Zainetto Tattico Esercito anni 60
Italian Army Small Tactical Back Pack 60s

It has backpack configurations, but the straps can be configured for a shoulder bag,

~ 16" w x 10h x 5 1/2 d
~ Two interior pockets for water bottles or small items
~ Bedroll attachment piece on bottom for hauling extra stuff
~ Backpack straps, but can be configured for a shoulder bag