: Before buying in bulk, take a finished sample to the post office. Square envelopes or heavy packages often require extra postage. 4. Where to Buy Your Supplies

Paper thickness is measured in pounds (lb) or grams per square meter (gsm). For invitations, you want something substantial:

: This is the sweet spot for most invitation cards, providing a professional heft.

: Use matte for a clean, crisp presentation and glossy if you want colorful photos to pop (though be mindful of fingerprints). 2. Choose the Right Weight (GSM)