• 1 envelope
• Bone scorer (or other scoring tool)
• Glue stick
• Decorations: patterned papers and embellishments or your own digital design*
Take an envelope. The one in the picture is 8 by 5 7/8 inches. Seal the flap completely. You may need to use a little extra glue at the ends (where most envelopes don't have any mucilage). Cut off the top to form the bag opening. I cut mine 6 ¾ inches tall.
Here are the complete instructions and digital design tips for Valentine's Bagalopes.