The envelopes were good. God is good (Matthew 19:17). He sent Jesus to die for lost sinners that they might be saved (John 3:16). Sinners are finally saved when they (a) believe in Jesus as the Son of God (John 3:16); (b) repent of their sins (Acts 2:38); (c) confess their faith in Christ with their mouths (Romans 10:10); and (d) are baptized "for the remission (removal) of their sins" (Acts 2:38).
The paper thickness is sturdy and the size is just right for folded computer paper. An update would be even better if the envelopes were self stick . The post office doesn't like metal clasps.