6x9 vs 4.125x9.5 Poly Mailers

Not sure which to pick? Use the Packaging Tools to get a recommendation.

Choose 6x9 when your item fits the 6x9 footprint. Choose 4.125x9.5 when your item needs more room in the 4.125x9.5 footprint.

6x9 options

• 6x9 Poly Mailers 2.5 Mil Self-Seal Tear Strip - 1000/Case
  $43.91In stock
• 6x9" Clear View Poly Mailers 2.5 Mil Self-Seal - Case of 100
  $15.78In stock
• 6x9" Reinforced Paper Ship-Lite¬Æ Self-Seal Mailers - Case of 100
  $27.81In stock
• 6x9" White Tyvek¬Æ Self-Seal Envelopes - Tear Resistant, Case of 100
  $34.47In stock
• 6x9" White Self-Seal Envelopes 28 lb. Paper - Case of 500
  $82.80In stock
• 6x9" Kraft Self-Seal Envelopes - No Moisture Needed, 28 lb. Paper, Case of 500
  $87.40In stock

4.125x9.5 options

• #10 Self-Seal Security Envelopes 9.5x4.125" 24lb White, 2500/Case
  $331.78In stock
• #10 Security Tint Redi-Seal Business Envelopes 9.5x4.125" - 24lb Paper, 2500/Case
  $401.67In stock
• #10 Redi-Seal Business Envelopes 9.5x4.125" 24lb White - Case 2500
  $412.40In stock

When to use

• Deciding between 6x9 and 4.125x9.5 for a new SKU or packaging refresh.
• Cost, protection, and throughput tradeoffs.

When not to use

• Edge cases where neither option fits — check the related guides.

Frequently asked