Not all fiberglass planters are created equal. If a planter feels surprisingly heavy, it could be made with filled resin that will add weight. However, this process also makes the planter more brittle. Check the outside of the surface for waves and bumps. If you feel them, the manufacture probably used off-spec resin, inadequate equipment and/or improper production techniques. A planter that carries these traits could fail at any time. Also, look at the inside of the container. If it contains sloppy strings of glass mat or globs of resin, it was produced improperly. On the outside of the planter, look for surface waves or rough spots. BotanicusDirect.com will always pass this inspection because of our high standards, skilled manufacturers and time-tested processing.