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Description: The Binding Hypothesis of working memory (WM) is that WM capacity is limited by interference between bindings but not items. It implies the prediction that with increasing set size, memory for bindings should decline, whereas memory for items should be (largely) unimpaired. Here we test the binding hypothesis for bindings between words and pictures. The results support the binding hypothesis. In addition, they demonstrate that episodic LTM contributes substantially to binding memory when the capacity of WM is stretched to the limit by larger set sizes. We show a double dissociation of contributions of WM and episodic LTM to binding memory: Performance at set sizes larger than 3 was specifically affected by proactive interference – but were immune to influences from a distractor-filled delay. In contrast, performance at set size 2 was unaffected by proactive interference but harmed by a distractor-filled delay.