Meta's MarTech 2016 sponsorship included a bag insert given out to all conference attendees. We really wanted our piece to be unique and memorable and provide long-term value beyond the duration of the conference. The bag inserts were constrained to an 8.5 x 11 size and had to remain relatively flat.
The solution I came up with is this 18 x 24 in double-sided poster. The poster is printed in full color on both sides and then map accordion folded down to a 6 x 9 in booklet, secured with double tabs on either side. The initial folded form is a manageable size that is easy to carry around while the additional panels that are revealed upon opening allow for ample advertising. After the piece is fully opened, the back reveals a surprise bonus poster featuring a quote from Leonardo da Vinci.