A complex that tethers COPII vesicles at ER-Golgi intermediate compartment. Its role in this part of the vesicular transport may start at the ER exit sites. Binds to a component of the COPII coat. In yeast it includes the following subunits: Bet3 (as homodimer), Bet5, Trs20, Trs23, Trs31, Trs33 which are regarded as the "core subunits" of all TRAPP complexes in yeast. [ http://www.ncbi.nlm.nih.gov/pubmed/22669257 http://www.ncbi.nlm.nih.gov/pubmed/20375281 ]