What Is a C5 Envelope?
A C5 envelope is a medium-sized mailing option, capable of comfortably holding folded A4 or UK letter paper, invitations, slim brochures, photos, and small booklets. Available in various paper weights, colours, and closures, this envelope suits professional, personal, and creative mailings that need extra space. Its size also fits neatly into standard filing and storage systems, combining practicality with versatility.
Why the C5 Size Stands Out in the Mailbox
The C5 envelope stands out in the mailbox thanks to its uncommon size, making it more noticeable than standard mail. Large enough to imply important contents without bulk, it creates a polished impression for business or personal use. Its distinctive shape helps promotional materials and invitations grab attention, boosting engagement. Available in vibrant and classic colours, these envelopes enhance brand visibility and response rates.
Perfect for Direct Mail Campaigns
Direct mail envelopes are an ideal size, offering enough space for flyers, small booklets, personalised letters, coupons, or samples. Their distinctive shape and professional look help capture recipients’ attention, making them a smart choice for businesses aiming to maximise engagement in direct mail efforts as they are cost-effective and easy to handle.
Ideal for Invitations and Event Promotions
C5 envelopes are perfect for mailing event invitations, save-the-dates, and RSVPs. Suitable for weddings, corporate functions, and parties, they offer more space than smaller options, allowing room for inserts, photos, and decorative touches. Custom printed envelopes add a premium feel and work well with multi-piece invitation suites. Available in sophisticated finishes and colours, these envelopes set the seal on your event mailings.
Business Documents That Fit a C5 Envelope
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Business papers (e.g., invoices, statements) folded into thirds
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Contracts, agreements, and reports of minimal sizing
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Promotional materials (e.g., flyers, postcards)
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Popular in legal, finance and real estate sectors for business correspondence
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Offers suitable space for documents whilst avoiding excess postage costs
Eco-Friendly and Cost-Effective Mailing
Eco-friendly direct mail envelope options make C5 envelopes a sustainable choice for businesses. Lightweight papers reduce postage costs, and bulk buying C5 envelopes helps save money whilst maintaining quality. Choosing these envelopes supports both your budget and the environment.
Custom Printing Options for Branding
Businesses can elevate their communications with custom printed envelopes in the C5 size, adding logos, brand colours, and tailored messaging for a professional look. Printing techniques like digital, flexographic, or spot UV deliver sharp, high-quality finishes that boost brand recognition. Whether for marketing campaigns, event mailings, or corporate correspondence, personalised designs help these envelopes stand out and reinforce your brand identity.
Where to Buy Quality C5 Envelopes in Bulk
All Colour is a trusted supplier offering a wide range of C5 envelopes ideal for bulk purchases. Buying in bulk ensures cost savings, steady stock, and fast shipping - helping your business stay efficient.
Our selection includes kraft, peel & seal, window, and padded envelopes to suit various mailing needs. Notable products are the C5 Mailer Gummed Cream 100gsm Envelopes, the elegant C5 Metallic Gold 130gsm Peel & Seal Envelopes, and the eye-catching C5 Pillar Box Red 120gsm Peel & Seal Envelopes - combining style and function.
Also available are customisation services like printing and branding for a professional, branded look. Still unsure of what your business needs? Sampling is also accessible. With reliable service and quick delivery, All Colour is a great choice for your C5 envelope needs.
Browse our collection to find envelopes perfect for mailing, marketing, or events.