Buying mailing bags wholesale is one of the simplest ways for an online seller to lower the cost of each parcel. Mailing bags are light, flat and used on almost every order of clothing or soft goods, so they are worth buying in volume. Pack Solution sells grey, white and coloured self-seal mailing bags, with volume pricing shown on each product page.
The savings depend on choosing the right sizes, ordering the right quantity and knowing when a different kind of packaging works better.
In This Guide
- Quick Picks: Mailing Bags for Bulk Orders
- Choosing Your Core Mailing Bag Sizes
- How Many Mailing Bags to Order
- Grey, White or Coloured Bags
- Cutting the Cost of Each Parcel
- When a Padded Envelope Works Better
- Packing Mailing Bags Well
- Storing Stock and Planning for Peaks
- Choosing a Mailing Bag Supplier
- Mailing Bag Buying Checklist
- Ordering Mailing Bags Wholesale
- Frequently Asked Questions
Quick Picks: Mailing Bags for Bulk Orders
Most sellers build their stock around one of these three, then add a second colour or a padded envelope as needed.
Best for everyday clothing and soft goods
Grey Mailing Bags
Opaque, self-seal polythene bags in the widest size range, from small accessories to bedding.
- 16 sizes from 4 x 6" to 34 x 42"
- Packs of 100, 50 or 25 depending on size
- Water resistant, no tape needed
From £2.90 ex VAT (£3.48 inc VAT)
Choose sizeView product
Best for a clean look with logo stickers
White Mailing Bags
White opaque bags that show a label or sticker clearly and are tamper evident once sealed.
- 5 sizes from 9 x 12" to 17 x 22"
- Self-seal strip with 50mm lip
- Packs of 100
From £4.50 ex VAT (£5.40 inc VAT)
Choose sizeView product
Best for fashion and beauty brands
Hot Pink Mailing Bags
A vivid hot pink that makes parcels easy to spot, with an opaque film that hides the contents.
- 5 sizes from 9 x 12" to 17 x 22"
- Self-seal strip with 50mm lip
- Packs of 100
From £4.50 ex VAT (£5.40 inc VAT)
Choose sizeView product- Grey Mailing Bags come in 16 sizes, from 4 x 6" to 34 x 42".
- White, Hot Pink and Green Mailing Bags come in five sizes, from 9 x 12" to 17 x 22", in packs of 100.
- All of them are opaque and self-sealing, so no tape is needed.
- Smaller grey sizes come in packs of 100, larger ones in packs of 50 or 25.
- Orders placed by 2pm Monday to Friday are dispatched the same working day.
Choosing Your Core Mailing Bag Sizes
Two or three sizes cover most clothing and soft goods ranges, and those are the ones to buy in volume.
Fold your best sellers the way you post them, then measure the width and length. The bag should be a little wider than the folded item and long enough to fold the lip over and seal without pulling the film tight. A bag that is too tight can split at the seal, and one that is far too big lets the contents slide around.
A typical clothing seller might use 10 x 14" for T-shirts and light tops, 12 x 16" for jumpers and jeans, and a larger size for coats or bundles. Your own sizes may differ, so check them against your products before you place a large order. The mailing bag sizes guide lists common garments against each size.
Good to know: Sizes are width x length. Measure the width of the folded item first, because that is the measurement that most often decides the bag size.
How Many Mailing Bags to Order
Order one or two months of your core sizes, based on last month's use plus a margin.
- Count how many orders went out in each bag size last month.
- Add 10 to 20 percent for busy days, repacks and damaged bags.
- Multiply by the number of months you want to cover.
- Round up to the next quantity on the product page if it lowers the price per pack.
- Set a reorder point at about two weeks of use.
As a worked example, a seller who posted 400 orders in 12 x 16" bags last month would need about 920 bags for two months with a 15 percent margin. That is ten packs of 100 if the size comes in packs of 100. Use your own figures; the point is the method.
Bulk mailing bags are easy to store. A box of several hundred flat bags fits on a shelf, which is why mailing bags are usually the first item sellers buy in larger quantities.
Grey, White or Coloured Bags
Grey is the everyday choice, while white and coloured bags help a parcel look branded.
| Bag | Sizes | Pack | Closure | Good for |
|---|---|---|---|---|
| Grey Mailing Bags | 16 sizes, 4 x 6" to 34 x 42" | 100, 50 or 25 | Self-seal strip | Everyday clothing, soft goods, documents |
| White Mailing Bags | 5 sizes, 9 x 12" to 17 x 22" | 100 | Self-seal, 50mm lip, tamper evident | Clean look, logo stickers, printed labels |
| Hot Pink Mailing Bags | 5 sizes, 9 x 12" to 17 x 22" | 100 | Self-seal, 50mm lip, tamper evident | Fashion, beauty, lingerie and gift sellers |
| Green Mailing Bags | 5 sizes, 9 x 12" to 17 x 22" | 100 | Self-seal, 50mm lip, tamper evident | Brands with a green colour scheme |
Grey Mailing Bags have the widest size range, including very small and very large bags, and they are the usual choice for wholesale postage bags. White Mailing Bags show a logo sticker or printed label clearly. Hot Pink Mailing Bags and Green Mailing Bags make a parcel easy to spot on a doorstep.
Best for matching a green brand colour
Green Mailing Bags
Bright green opaque self-seal bags, light and water resistant.
- 5 sizes from 9 x 12" to 17 x 22"
- Tamper evident seal
- Packs of 100
From £4.50 ex VAT (£5.40 inc VAT)
Choose sizeView productAll four bags are opaque, so nobody can see what is inside on the way to the customer. That matters for gifts, lingerie and higher value clothing. The white and coloured bags are also tamper evident, which means a seal that has been opened shows clear signs of it.
Colour is a branding choice, so keep it simple: one colour in your core sizes is easier to manage than several colours in many sizes. The mailing bags collection shows every colour side by side.
Cutting the Cost of Each Parcel
The cost of a parcel is the bag, the label, any inner packaging and the postage, so all four are worth checking.
Mailing bags already keep postage down because they add very little weight. The next saving is size: a bag that fits closely keeps the parcel compact, which matters for carriers that price by size as well as weight.
Labels add up at volume. Fanfold Thermal Labels 4 x 6" come in a folded stack of 1000 and print with heat, so there is no ink or ribbon to buy. A stack lasts far longer than a small roll, which means fewer interruptions on a busy day.
Best for printing labels in high volume
Fanfold Thermal Labels 4 x 6"
A folded stack of 1000 direct thermal courier labels, so you reload far less often than with small rolls.
- 4 x 6" (101.6 x 152.4mm)
- Stack of 1000 labels
- Direct thermal, no ink or ribbon
£12.00 ex VAT (£14.40 inc VAT)
Buy nowView productDelivery of your stock matters too. Royal Mail Tracked 48 is free on every order with no minimum, so you can order postage bags bulk quantities without adding a delivery charge to the cost of each bag.
When a Padded Envelope Works Better
Use a padded envelope for small items that need some cushioning, and keep mailing bags for soft goods.
A mailing bag protects against rain and scuffs but has no padding. Jewellery, cosmetics, small electronics and boxed accessories travel better in White Bubble Padded Envelopes, which have a bubble lining and a self-seal strip. They come in ten sizes, from EP1 at 100 x 165mm to EP10 at 350 x 470mm, in boxes of 100.
Best for small items that need cushioning
White Bubble Padded Envelopes
Self-seal white envelopes with a bubble lining, in boxes of 100.
- 10 sizes, EP1 to EP10
- 100 x 165mm up to 350 x 470mm
- Bubble lining
From £8.00 ex VAT (£9.60 inc VAT)
Choose sizeView productMany sellers stock both: mailing bags for clothing and one or two padded envelope sizes for small extras. Both are flat and light, so they share shelf space easily. The envelopes range has board back and capacity envelopes for documents and thicker items.
Packing Mailing Bags Well
A well-packed mailing bag is flat, snug and sealed along the full length of the strip.
Fold the item neatly before it goes in, so the parcel stays flat and fits through letterboxes and parcel lockers more easily. Push out excess air before sealing. Then peel the backing from the self-seal strip, fold the lip over and press firmly from one end to the other, so there are no gaps at the corners.
Put the label on a flat area away from the seal, where it will not crease. If you include a returns slip or invoice, slide it in with the item rather than leaving it loose, so it does not catch on the seal. For clothing that needs to stay clean or uncreased, an inner clear bag inside the mailing bag works well; the guide to mailing bags for clothes covers which size suits each garment.
Storing Stock and Planning for Peaks
Keep bags flat in their boxes, somewhere dry and away from heat, and raise your stock levels before busy seasons.
Polythene bags store well, but direct sun or a hot radiator can soften the adhesive on the seal strip over time. Keep packs in their outer box until you need them, and put new deliveries behind older stock so older bags are used first.
Most online sellers see orders rise from late October to Christmas, and again around big sale events. Order your core sizes a few weeks before the rush, when there is time to check what arrives. During a peak, a stock check every week is worth the few minutes it takes, because running out of your main bag size stops every order that uses it.
Choosing a Mailing Bag Supplier
For most online sellers, a stockist that dispatches quickly and shows volume pricing up front is the simplest source of bulk mailers.
Mailing bag manufacturers make the film and bags in long production runs. Going direct suits a business that wants printed bags or a custom size in very large numbers, but it usually means a large first order and a wait for production.
A stockist sells standard sizes in packs, so you can buy poly mailers bulk quantities without committing to a production run. Wholesale postal bags from a stockist also arrive with the rest of your order, such as labels and padded envelopes. If you also use clear inner bags or larger polythene, the guide to plastic bag suppliers and poly bags wholesale covers those, and the wholesale packaging supplies guide explains volume buying across boxes, tape and labels.
Mailing Bag Buying Checklist
- Measure your best sellers folded, width first.
- Choose two or three core mailing bag sizes.
- Pick one colour for your core sizes.
- Work out monthly use from last month's orders plus a margin.
- Order one or two months of each core size.
- Keep a padded envelope size for small items that need cushioning.
- Use 4 x 6" thermal labels if you print courier labels.
- Set a reorder point at about two weeks of stock.
Ordering Mailing Bags Wholesale
Fit your bag sizes to your products, buy your core sizes in volume and add padded envelopes for small items. Labels for printing courier addresses are in the labels collection.
Frequently Asked Questions
How many mailing bags should I order at once?
Count how many bags of each size you used last month, add 10 to 20 percent for busy weeks, and order one or two months of your core sizes. Mailing bags are flat and light, so a two-month supply of two or three sizes takes little space.
Is it cheaper to buy mailing bags wholesale?
Yes, when you buy more of the same size. Volume pricing on each product page lowers the price per pack as the quantity rises. Prices are shown ex VAT, with VAT added at checkout, and Royal Mail Tracked 48 delivery is free with no minimum order.
What sizes do wholesale postage bags come in?
Grey Mailing Bags come in 16 sizes, from 4 x 6 inches (100 x 150mm) to 34 x 42 inches (850 x 1050mm). White, Hot Pink and Green Mailing Bags come in five sizes from 9 x 12 inches (230 x 300mm) to 17 x 22 inches (430 x 560mm).
Should I use mailing bags or padded envelopes?
Use mailing bags for clothing and soft goods that cannot break. Use a padded envelope for small items that need some cushioning, such as jewellery, cosmetics or small electronics. White Bubble Padded Envelopes have a bubble lining and come in 10 sizes.
Do coloured wholesale postal bags cost more than grey?
Coloured and white bags start from a higher price per pack than the smallest grey sizes, because grey runs down to small 4 x 6 inch bags. Compare the same size across colours on the product pages to see the difference for the sizes you use.
Can I buy poly mailers bulk and get them quickly?
Orders placed by 2pm Monday to Friday are dispatched the same working day, and Royal Mail Tracked 48 is free on every order. Express and DPD next day options are also available at checkout.
