Assertion: backpack's model | /r/CapableOf | add reflective materials
Facets:
value: for added safety
type: PURPOSE
value: sometimes
type: TEMPORAL
Source sentences:
text: This may be combined with webbing or cordage straps, while more sophisticated models add extra pockets, waist straps, chest straps, padded shoulder straps, padded backs, and sometimes reflective materials for added safety at night.