Avery® 耐用透明視窗三環活頁夾，4 吋 EZD® 環，白色，1 個

The 4-inch rings hold a massive amount of paper without bulging, and the DuraHinge spine survived a semester of being tossed in my backpack.

The 4-inch rings hold a ton of paper without bulging, and the DuraHinge spine has survived being tossed in my backpack every day this semester.

I've been hauling this binder to class every day for a month, and the DuraHinge is holding up way better than any previous binder I've wrecked. The 4-inch EZD rings open with one hand, which makes swapping out handouts mid-lecture a total breeze. Only wish it came in more colors, but white is clean