There are two main classes of traffic intermediates that operate in intracellular trafficking pathways: small round vesicles (SRVs), and large pleiomorphic carriers (LPCs).

See also

 secretion vesicles
 secretory pathway

References

Luini A, Ragnini-Wilson A, Polishchuck RS, De Matteis MA. Large pleiomorphic traffic intermediates in the secretory pathway. Curr Opin Cell Biol. 2005 Aug;17(4):353-61. PMID: #15993575#

Robinson MS. Adaptable adaptors for coated vesicles. Trends Cell Biol. 2004 Apr;14(4):167-74. PMID: #15066634#