Indigo® C4 White Window Envelopes - Self Seal, 90gsm Premium Quality, 324x229mm A4 Size - Strong Eco-Friendly Mailing Envelopes for Home, Office & E-Commerce Postage - Pack of 25

C4 Size (324 × 229 mm) - Holds A4 sheets flat without folding, ideal for letters, invoices, or brochures. 90gsm High-Quality Paper - Strong and reliable, preventing rips or bends during transit. Clear Window Panel - Displays address neatly for a professional appearance and efficient mailing. Self-Seal Closure - Simple peel-and-press seal saves time and ensures secure posting. Eco-Friendly Paper - Made from PEFC-certified materials that are fully recyclable and sustainably sourced. Multi-Purpose Use - Suitable for offices, small businesses, and home correspondence. Pack of 25 Envelopes - Great value for regular use or business mailing needs.