- LETTER - Letter. Generates a First-Class label with IMB barcode. * FRE - Flat rate envelope. * LGENV - Legal flat rate envelope. * LGLFRENV - Padded flat rate envelope. * PFRENV - Small flat rate box. * SFRB - Medium flat rate box. * FRB - Large Flat rate box. * LFRB - DVD box. * DVDBOX - DVDBOX. * VIDEOBOX - Video box. * MLFRB - Military flat raqte box. * RBA - Regional rate box, type A * RBB - Regional rate box, type B. * PKG - Package (not eligible for special package rate). * LP - Large package. * FLAT - USPS Flat or Large Envelope. * EMMTB - Extended Managed Mail Tray Box. * FTB - Full tray box. * HTB - Half tray box. * SACK - Sack. * FTTB - Flat tub tray. * SOFTPACK - Soft Pack Envelope. * MIX - PMOD Enclosed Package Type. * LTR - Letter for stamp API call.
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