Send bulky items with confidence in these high quality white gusset envelopes which provide a combination of good looks and strength. Exceptionally strong 120gsm white paper across the whole range. 25mm 'block bottom' style gusset maximises available capacity. All feature Peel and Seal adhesive for an exceptionally strong seal. 324x229x25mm. Window Size: 45 x 100mm. Window Position: 25mm in/213mm up.