<https://precisionenvelope.com/product/9-1-2-x-12-1-2-open-end-envelopes-24lb-white-wove-plain/#itempage>
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"These durable 9 1/2″ x 12 1/2″ open end envelopes (sometimes known as catalog envelopes) do not require that your materials be bent. It’s why our customers love using them for shipping photographs and important documents, as well as storing paperwork around the home or office. Stock: 24lb. White Wove Size: 9.5″ x 12.5″"
<https://precisionenvelope.com/product/9-1-2-x-12-1-2-open-end-envelopes-24lb-white-wove-plain/>