Bubble Mailer Envelope BSTech K20 — 370 x 480 mm, 50 pcs, padded protective mailing envelope

BSTech Bubble Mailer Envelope K20 in size 370 x 480 mm is a padded protective mailing envelope designed for shipping medium-size items. Each pack contains 50 self-sealing envelopes featuring an internal air bubble lining and a tear-resistant exterior. The lightweight construction reduces postage costs while providing cushioning to protect books, documents, electronics and small parts during transit.

Advantages

The BSTech K20 bubble mailer combines a durable outer layer with internal air-bubble cushioning to absorb shocks and resist punctures and tears. Self-sealing adhesive strips speed up packing and provide a secure closure without additional tape. The envelopes are lightweight to help keep shipping costs down while still offering reliable protection for non-fragile to moderately fragile items.

Suitable for

• Mailing books, magazines and printed materials
• Sending small electronics and accessories (chargers, cables, cases)
• Packaging small parts, components and spare parts
• Posting documents and flat items that require light cushioning

When it may not be suitable

These padded envelopes are not intended for heavy or highly fragile items that require rigid protection or specialized shock-absorbing packaging. Bulky or sharp-edged objects may still puncture the bubble lining or deform the envelope, so rigid boxes or additional internal protection should be used in those cases.

Key specifications

• External dimensions: 370 x 480 mm
• Packing quantity: 50 envelopes per pack
• Internal cushioning: air bubble lining
• Closure type: self-sealing adhesive strip
• Exterior: tear-resistant, lightweight material

How to use

Insert the item into the envelope so it lies flat against the bubble lining, fold down the flap and remove the protective strip from the adhesive. Press the flap firmly to close and ensure the seal is tight along the edges. For additional security or for higher-value goods, consider reinforcing the seal with tape or placing the item in an inner protective sleeve before inserting into the mailer.

What to consider before purchase

• Verify that the 370 x 480 mm internal space is sufficient for your item, including any inner packaging.
• Assess the fragility and weight of the item — use a box or additional padding for heavier or very fragile goods.
• Consider postage costs and carrier size limits for padded envelopes of this dimension.

Usage recommendations

Use BSTech Bubble Mailer K20 for documents, books and small electronics that need light-to-moderate protection. For sharp or heavy items, add internal reinforcement or choose a rigid box to avoid punctures and ensure safe delivery.