Envelopes are a critical stationery item in any office or at home and there are so many envelope types and sizes- you may want an envelope that is professional, formal, secure or fun. We’ve researched all the envelope options below – just click on any of the underlined link or image to be directed to where to purchase envelopes.
Also see our Stamp Guide to learn more about postage.
1. Envelope size
The three most common envelope sizes are C4 (A4), C5 (A5 / A4 divided in half) or DL (A4 sheet or paper folded into 3 equal sections). However there are a plethora of letter sizes to choose from. Different envelope types and sizes will effect the postage cost – see also our Letter Size Guide.
Click on any of the underlined links or images below to be directed to where to purchase the different envelope types and sizes.
2. Envelope Colour
There are many colours on Envelope – they come in more colours than just white and manila (brown). Different coloured envelopes can signify different purposes such as orange for internal mail, cream for a formal invite or silver for a bit of fun!
3. Windowed Envelopes
A windowed envelope has a plastic film window to allow the recipient’s address to be printed on the paper inside. It has become ubiquitous among modern commercial mailings as it saves time, cost and maintains quality.
Windowed envelopes come in a variety of sizes but are typically only available in white.
4. Quality and Paperweight
The paper weight of letters can span from an economical, albeit less robust 75gsm to a prestige 120gsm:
- 75gsm envelopes are designed for everyday use and are lightweight albeit at this low weight they will only be available in manila as white paper is not strong enough
- 90gsm envelopes are the basic, economical option for white envelopes that are available with or without windows
- 100gsm envelopes are the robust paper choice that we would recommend for standard letters
- 110gsm offers a premium letter option when a basic letter will not do!
- 115gsm letters are robust brown envelopes to make sure the contents are kept safe
- 120gsm prestige envelopes make that crucial impression for formal letters and invites
5. Windowed Envelopes
A windowed envelope has a plastic film window to allow the recipient’s address to be printed on the paper inside. It has become ubiquitous among modern commercial mailings as it saves time, cost and maintains quality.
Windowed envelopes come in a variety of sizes but are typically only available in white.
Gummed seal
These envelopes have a strip of a water soluble gum that you can 'lick closed'. If these envelopes are stored in the correct conditions, they should last for a number of years
Self seal
These envelopes have a strip of latex on each flap and, when they are pressed together, they form an instant bond. The latex on self seal envelopes usually has a guaranteed shelf life of about twelve months
Peal and seal / Powerseal
These envelopes have a release tape that you can peel away from the flap to reveal a strip of latex to press down to form an instant bond. This is one of the most secure ways to seal an envelope and can have a shelf life of up to 5 years
6. Labelled Envelopes
Envelopes with important contents or destined for a far-flung destination often need labels to ensure they are handled correctly during their journey.
Airmail
Airmail Envelopes are perfect for airmail writing and sending abroad
Board Backed Envelopes
Board Backed Envelopes for sending important documents including certificates, as they offer a hard back, ensuring extra protection and are labelled 'do not bend'
7. Speciality Envelopes
Some envelopes have a specific purpose so it’s important to choose the right one for the job.
Gusset Envelopes
Gusset envelopes hold more paper than a standard envelope and are available in a range of sizes
Padded Envelopes
Bubble bags, padded envelopes and Jiffy bags prevent damage to the envelope's contents
Tyvek Envelopes
Tyvek envelopes are made of high quality fibres which makes them extremely strong and virtually indestructible
Recycled Envelopes
Eco-friendly and recycled envelopes are manufactured using recycled products and recycled paper
Polythene Envelopes
Polythene envelopes protect against weather and other elements
Wage Envelopes
Manila wage envelopes hold notes and coins as well as wage slips