• Delivery vans

    Free UK* delivery

    No minimum order necessary. Next day, express and worldwide options available.
    * A small charge may apply for NI, Highlands and Islands

  • Polythene Mailers

    Huge range of mailing bags

    Manufactured for postal or courier transport, mailing bags are tough, water resistant, light and easy to use with a self-sealing adhesive strip.

  • Bespoke Mailing Bags

    Can't find what you want?

    Then we can make it! Complete the printed mailing bags form and we'll send you some samples, agree a design at a price that suits you and then manufacture it all for you!

  • Mailing Bags Offers

    Available in all standard sizes

    We stock envelopes in all styles, shapes and sizes. Check out our useful guide on standard envelope sizes to help you choose the right envelope for your needs.

  • Eco-Friendly Mailers

    Environmentally friendly mailing bags

    If you want to look out for the environment whilst sending your post, take a look at our range of biodegradable mailing bags. Be kind to your pocket and to the environment.

Mailing Bags

Mailing BagsMailing bags come in a wide variety of styles, shapes and sizes and can be made from a wide variety of materials that include paper, plastic, vinyl and canvas, as well as others. They are designed according to the different types of products that need to be posted. Mailing bags have many functions that also go above and beyond just safely transporting your package. These additional functions range from protection of the product from weather or punctures to getting out a sales and promotional message. Plastic, or polythene mailing bags are becoming quite a popular choice in today's business world as well as a popular mailing bag choice for personal mailing needs as well. This is due to the wide variety of choices on the market today in the types of available polythene mailing bags with a wide range of sizes and colours. Their additional features also appeal to many different customers for a wide range of uses, both business and personal.

There are so many choices for polythene mailers available on the market today that you should be able to find the right product to meet your particular needs. Plastic mail order bags can be clear or coloured and come in a wide range of sizes from smaller than an envelope to quite large. They can also be high or low density polythene, flat, ziplock or zipper mail bags, gusseted, reinforced and cushioned. Some are also made with laminated paper.

Royal Mail postage costs: a confusion-busting guide

New criteria introduced by the Royal Mail in April 2013 have lead to some confusion over the cost of posting parcels. Previously, parcels were classified on the basis of weight only. Since April 2013, parcels are both measured and weighed before being classified. Prices were updated again on 31 March 2014, although the means of classification stayed the same.

All parcels to be posted are classified as either small, medium or large - based on both their weight and dimensions - and the cost of postage calculated accordingly.

Before April 2013, any parcel weighing up to 2kg cost no more than £5.30 to post. Now, if just one of the dimensions of the parcel is greater than 8cm, it will be classified as a medium parcel and will cost a minimum of £8 to post (second class).

On the other hand, a small parcel weighing between 751g and 1kg now costs only £3.20 to post second class, whereas it used to cost at least £4.30.

Royal Mail say the new prices are more in line with the actual cost of handling and delivering items. It takes into account the fact that some larger, lighter items need to be delivered by van.

On 31 March 2014, Royal Mail introduced a second option for small parcels, which must now be bigger than either 45cm x 35cm x 8cm - around the size of a cereal box - or 35cm x 25cm x 16cm - i.e. twice the thickness but shorter and narrower.

Cylindrical parcels qualify as small parcels under the new system provided they weigh no more than 2kg and measure no more than 45cm in length and 8cm in diameter.

The following guide should help you calculate your postage and avoid unexpected delivery costs.

Royal Mail size and weight allowances for UK post


Max. length

Max. width

Max. thickness

Max. weight







Standard letter, greeting card, postcard

Large Letter





Small books, magazines, CDs & DVDs (in cases)

Small parcel (option 1)





Large books, items of clothing, toys and gifts

Small parcel (option 2)





Books, DVD boxsets, clothing, toys and gifts

Medium parcel





Larger items of clothing, footwear, household appliances

Large Parcels:

Any parcel exceeding just one of the maximum allowed limits for a medium parcel will be considered a large parcel.


Rolled and cylinder shaped parcels that measure up to 45cm in length and 8cm in diameter and do not exceed 2kg can be sent as small parcels. For larger rolled and cylindrical parcels, the length of the item plus twice the diameter must not exceed 104cm, with the greatest dimension being no more than 90cm. For further details, visit royalmail.com/prices-2014.

Royal Mail postage costs

Royal Mail postage costs for parcels sent within the UK from 31 March 2014:


Royal Mail 1st Class

Royal Mail 2nd Class


Small Parcels

Medium Parcels

Small Parcels

Medium Parcels

up to 1kg





up to 2kg





up to 5kg





up to 10kg





up to 20kg





Inclusive compensation





Other services:

The above table lists standard Royal Mail services for UK postage only. Other services are also available, including Confirmed, Guaranteed and International Standard and Confirmed. For further details, visit royalmail.com/prices-2014.

Large parcels:

Any large parcel (see table: 'Royal Mail size and weight allowances for UK post') cannot be sent via standard Royal Mail services but will require a courier service, such as Royal Mail partner Parcelforce Worldwide. These services will, as standard, incur a greater cost than regular post, but they provide tracking and can guarantee delivery by a particular time.


Rolled and cylinder shaped parcels that measure up to 45cm in length and 8cm in diameter and do not exceed 2kg can be sent as small parcels. For further details, visit royalmail.com/prices-2014.

Post it!

Glossy Blue Mailorder Bag Polybags has loads of options for mailing bags in a range that includes lightweight polythene mailers, Mailtuf for heavy duty mailing, Mailbudget for economic 'Peal n' Seal' style envelopes and opaque Tamper Evident mailers to protect the contents and ensure it is only opened by the right person.

As featured on Polybags.co.uk the glossy blue mailorder bag is a top selling strong lightweight bag available in a range of popular sizes which is great for internet or mail order businesses.

Clear plastic mail bags

Clear plastic mail bags work great for sending magazines, brochures, newsletters or any other type of mailing in which it may be to your advantage to use clear packaging. Usually these clear plastic mailers are highly tamper resistant and come with a self seal. You can attach address labels or you can also use their write on panels for addressing your packaging. Perhaps the type of mailing you do on a regular basis is a bit more confidential or you mail a different type of product in which clear plastic mail bags will not work for you. There are so many other options available in colored plastic mailing bags for you to choose from as well that you're sure to find the right product for your needs.

Custom-printed polythene mailing bags

Along with the various types available today, they can also be pre-printed. You can have your return address or a personalized message designed on your polythene bags. This can also be a great marketing tool as you can add a company logo or slogan and promotional messages that will be highly visible as you package travels to its destination. These custom-printed polythene mailing bags can be printed in large quantities on just about any type of plastic mail order bag you may need. Plastic mailing bags can also be made to look highly professional and very attractive to your customer base, no matter what type of polythene mailer you use. Sometimes businesses also use custom printed plastic mail bags as business and corporate gifts to employees or other businesses as the message can be personalized in any fashion needed for any occasion.

Coloured mailing bags - bring your parcels to life!

Coloured mailing bagsNothing cheers you up more in the morning than when the postman delivers a lovely parcel - except when that parcel is bold, vivid and brightly coloured! You too can bring a smile to your customers' faces and make your mail stand out from the rest with Polybag's fantastic range of coloured mailing bags.

Available in a range of colours including baby pink - perfect for packaging baby presents and other gifts - and eco green - ideal for sending eco-friendly goods or home and garden products.

The classic glossy blue mailer gives your deliveries that slick, professional look, or you could choose vibrant purple to really stand out from the crowd. If you want another colour, no problem - just ask and it will be made just for you.

Life's too short to stick with shades of grey. Pick your colour, order your mailing bags and bring your parcels to life!

Get a box of Santa's favourite sacks for FREE!

We've teamed up with www.polybags.co.uk, our parent site, to give you fabulous Christmas offer! Place any online order for mailing products or any other packaging products with us or Polybags and get a free box of 200 Premier Quality Heavy Duty Bin Bags! Order must be for £60 or more (excluding VAT and any Delivery). Standard UK delivery is free with no minimum order for most of the UK!