USPS Flat Rate Boxes and Envelopes

USPS Flat Rate Box

Uline's equivalent sizes to USPS's popular flat rate program.

USPS
FLAT RATE SIZE		 MODEL
NO.		 ULINE
EQUIVALENT SIZE		 DESCRIPTION
Small
8 5/8 x 5 3/8 x 1 5/8"		   S-15027   8 x 6 x 2"   200# Corrugated
  S-13363   8 x 6 x 2"   White Indestructo
Medium
11 x 8 1/2 x 5 1/2"		   S-4607   11 x 8 x 6"   200# Corrugated
  S-4609   11 1/4 x 8 3/4 x 6"   200# Corrugated
Medium
13 5/8 x 11 7/8 x 3 3/8"		   S-7357   11 1/4 x 3 x 15 1/8"   White Side Loader
  S-4620   14 x 11 x 3"   200# Corrugated
  S-4695   14 x 12 x 4"   200# Corrugated
Large
12 x 12 x 5 1/2"		   S-4122   12 x 12 x 6"   200# Corrugated
  S-4341   12 x 12 x 6" Multi-Depth   200# Corrugated
  S-4770   12 x 12 x 6" Heavy Duty   275# Corrugated
  S-4932   12 x 12 x 6"   200# White Corrugated
  S-4489   12 x 12 x 5"   200# Corrugated
Priority/Express Envelopes
12 1/2 x 9 1/2"		   S-7537   12 1/2 x 9 1/2"   White Express Self-Seal
  S-2665   9 3/4 x 12 1/4"   White Self-Seal
  S-902   9 3/4 x 12 1/4"   White Tab Locking
  S-5465   9 3/4 x 12 1/4"   Kraft Self-Seal
  S-2220   9 3/4 x 12 1/4"   Kraft Tab Locking
  S-11837   9 3/4 x 12 1/4"   Black Self-Seal
 
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