Logo envelopes are pre-assembled envelopes that can be printed with a logo or design on the front surface. Custom envelopes offer the potential for more creativity and color, as you can print colors or designs on both the inside and outside of an envelope. Logo envelopes are printed digitally, while custom envelopes are printed offset. Digital printing is considered a faster method of printing, as envelopes are pre-assembled before the design is applied. Offset printing takes longer as the processes is more rigorous, yet the color vibrancy is worth the wait.