Abstract: A spacer tray 2 for containers 32 is formed of a moldable sheet material and is shaped to provide a plurality of container-bottom receptacles 4. Each container-bottom receptacle 4 is shaped to receive at least a part of a bottom portion of a container 32. A container spacer wall 30 is located between each pair of adjacent container-bottom receptacles 4 to maintain bottom portions of containers seated in the receptacles spaced apart from one another. The spacer tray includes a plurality of container-loading-guide-pin caps 36 which permit end portions of container-loading guide pins 78--from a high-speed spacer-tray loading machine, for example--to project into and fit within the interiors of the caps for locating the spacer tray 2 and for reinforcing the caps for guiding bottom portions of containers 32 into container-bottom receptacles 4 during loading of the spacer tray.