| 摘要 |
The invention is a binder or portfolio for carrying looseleaf paper, books, school supplies, etc. wherein the binder includes an expandable gusset attached to the front and back covers of the binder. The gusset is preferably made from an elastic material, such as neoprene, so that the gusset may expand if the binder is filled to greater than normal capacity without threatening the integrity of the binder.
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