Shipping Bags

Which shipping bags are available?

Shipping bags are the right choice when your goods are flat or slightly bulky and a carton would be oversized. At verpacking.com you'll find five material variants (bubble, foil, cardboard, paperboard, paper), gusset envelopes for contents that vary in volume, and letter envelopes for pure mail correspondence. Which type fits depends on how much your contents need to be protected against creases, shocks or moisture.

• For pure letters and thin documents, a classic letter envelope is enough.
• For flat, robust goods, a light variant made of thin material is enough.
• If the contents must not crease, a rigid variant is the right choice.
• If the contents are slightly bulky and shock-sensitive, a padded variant is the right choice.
• If the contents need to be protected against moisture, a water-resistant variant is the right choice.
• If the contents vary in volume or need to grow with the bag, a variant with side gussets is the right choice.
• For standard DIN contents, the format of the bag matters as a second axis.

What matters when choosing

1. Contents and sensitivity

The sensitivity of the contents defines the level of protection you need, not the monetary value. Ask yourself: Are the contents thin and flat? Do they build up slightly? Are they crease-, shock- or moisture-sensitive? Your answers tell you which protective function the bag has to provide.

2. Format and inner dimensions

The contents have to fit flat into the bag without pressure, with minimal play. Measure the contents, compare them against the inner dimensions, leave reserve for the fold and seal, and check the DIN reference. A4 fits unfolded into C4, folded once into C5, and slightly larger or slightly bulky A4 shipments into B4.

3. Material and design

The material decides what the bag protects against: creasing, shocks or moisture. The design decides whether the bag stays flat or grows with the contents. Choose by protection need and contents geometry, not by price. Which type fits which case in detail, and where each one reaches its limits, you'll find in the type comparison below.

4. Closure

The closure has to match your handling volume. Self-adhesive and pressure-sensitive seals are standard. A tear strip makes opening easier. A second adhesive strip turns the bag into a returns- or reuse-ready bag. Tamper-evident closures show whether the bag was opened in transit, relevant for sensitive or documented shipments.

5. Build height and gusset function

The build height decides whether the bag stays flat or grows with the contents. Standard bags are strictly flat. Gusset envelopes (also called expansion envelopes) have side gussets or a block bottom that open as you fill the bag. If the contents build up and the bag isn't designed for it, the seams or seal will tear.

6. Postage format as a principle

The outer dimensions and height of the filled bag decide which postage category applies (standard letter, large letter, maxi letter, parcel). Measure the filled bag at the thickest point, not the empty one. Check exact tariffs and size limits with your shipping provider.

Types compared

Bubble wrap envelopes protect shock-sensitive small goods such as books, small electronics or cosmetics through a built-in cushioning layer. For very large or sharp-edged contents the cushioning isn't enough. Sensible when cushioning matters more than rigidity.

Foil mailing bags suit textiles, clothing, unbreakable small parts and printed matter that needs moisture protection. They offer neither rigidity nor crease protection. Sensible when moisture protection and low weight are the deciding factors.

Cardboard shipping bags suit flatter contents that need stability, such as books, parts of folders or slightly bulky items. They are thicker and more rigid than padded or foil solutions. Sensible when stability for flat shipments is needed.

Paperboard shipping bags are designed for crease-sensitive contents such as certificates, photos, pictures and jewellery. They are heavier than paper or foil. Sensible when crease protection is the top priority.

Paper shipping bags are designed for documents, brochures, flyers and thin printed matter and come in the DIN formats C4, C5 and B4. They offer no crease protection, no shock absorption and no moisture protection. Sensible when the contents are robust and flat.

Gusset envelopes have side gussets or a block bottom and adapt to the volume of the contents. They are less flat in storage than standard bags and usually more expensive per unit. Sensible when the contents vary in volume and one format should cover both cases.

Letter envelopes are designed for pure mail correspondence: business letters, invoices, multi-page documents up to a few sheets. They offer no goods protection, just the classic paper sleeve, often with a viewing window. Sensible when it's about written correspondence, not about goods.

Real-world special cases

Clothing shipments in online retail

For high-volume clothing shipping, the foil mailing bag is the standard. For returns-heavy businesses, a variant with a second adhesive strip or built-in returns label is worth it, so the customer can reseal the bag without extra material.

Shipping multiple pictures or photos

Multiple pictures inside one paperboard shipping bag need extra protection against stack pressure. Glue the pictures back to back in pairs and add a thin pad between them. Crease protection alone doesn't prevent pressure marks caused by stacked items.

Job application folder or multi-page business mail

A job application folder or a thick contract no longer fits cleanly into a letter envelope without creasing or straining. As soon as the contents include more than around ten sheets, a sleeve or a folder, a gusset envelope is the right choice. It lies flat in storage and only takes on the required volume when filled.

Common mistakes and how to avoid them

1. Paper shipping bag for sensitive goods. Choose the material by protection needs (see selection criterion 3).
2. Bag too small, A4 contents get folded. Check the inner dimensions against the contents (see selection criterion 2).
3. Letter envelope for a job application folder. Use a gusset envelope as soon as the contents build up or exceed a few sheets.
4. Postage calculated based on empty bag. Measure the filled bag at its thickest point (see selection criterion 6).
5. Foil mailer for crease-sensitive pictures. Use a paperboard shipping bag, foil offers no rigidity.
6. Bag without tear strip for a returns model. Pick a closure with a tear strip or second adhesive strip (see selection criterion 4).

Subcategories and accessories

Shipping bags by material and design:

• Bubble wrap envelopes
• Foil mailing bags
• Cardboard shipping bags
• Paperboard shipping bags
• Paper shipping bags, available in C4, C5 and B4
• Gusset envelopes
• Letter envelopes, available with window, without window or in DIN Long format

Frequently asked questions about shipping bags

What shipping bag sizes does verpacking.com offer?

Verpacking.com carries DIN formats C4, C5 and B4 among the paper shipping bags, plus foil mailers in sizes S to 6XL. The exact sizes vary by material and manufacturer.

How do I choose between shipping bag C4, C5 and B4?

C4 fits unfolded A4 documents. C5 is designed for A4 contents folded once. B4 is slightly larger than C4 and takes slightly bulky A4 shipments, thin folders or several documents combined.

Can I have shipping bags printed?

Custom printing is possible on certain materials. The range includes standard bags as well as printable variants, for example bubble wrap envelopes and cardboard shipping bags with logo.

How do I label a shipping bag correctly?

Place the address label clearly visible on the smooth front, leave enough distance to the closure and edges, and use foil-optimised label adhesion on foil bags.

When is a gusset envelope better than keeping two different sizes?

When your contents vary daily between flat and slightly bulky. One stock format then covers both cases instead of two.

Shipping bag or letter envelope, when do I use which?

Letter envelope for pure mail correspondence up to a few sheets. Shipping bag as soon as you ship goods, thicker folders or items needing protection, because shipping bags are made of sturdier materials and have the closure flap on the short side.

Are shipping bags reusable?

Some variants have a second adhesive strip or tear strip designed for returns or reuse. Standard bags are usually single-use products.

How do I choose the right size for clothing shipments?

Lay the garment flat folded and measure length and width with about two finger widths of reserve. For thicker items like hoodies or knitwear, pick one size larger so the closure doesn't strain.