Storage Bin privileges are a perk for "Pro"-level members only. They are provided for pro members on an as-available basis only, and not a guarantee.
To obtain a storage bin you must:
Have and maintain an active "Pro" level membership in good-stanging
Sign the MakeIt Labs Storage bin (specific) waiver
Log into the AuthIt with your member credentials then go to https://auth.makeitlabs.com/authit/prostore/choose to select your bin preference