RuneScape Classic Wiki
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RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Maple logs certificate

A Maple logs certificate is a certificate that is obtained by exchanging five maple logs with Chuck north of East Ardougne. Maple log certificates are stackable and each one can be exchanged back for five maple logs by talking to Chuck.

Because maple logs are not stackable and players can only trade twelve items per trade screen, they are often exchanged for certificates so that they can be traded easier and faster.