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Expandable Plastic Envelopes with Snap Buttons Translucent Colors 401Q 400F 405A 415A 403A 404B are made from durable 200 micron polypropylene PP sheet, water and tear resistant., snap buttons closure to secure contents, top loading with bottom expandable up to 3 cm., ideal for school, work, office ,travel, personal or even at home and protecting documents from dirt, grease and moisture.
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Item description

Expandable Plastic Envelopes with Snap Buttons Translucent Colors 401Q 400F 405A 415A 403A 404B 

  • are made from durable 200 microns (0.2 mm.) PP Polypropylene Plastic sheet , water and tear resistance, light weight and long lasting ,translucent colors
  • Snap Buttons closure to secure contents, envelope with top loading , expandable up to 3 cm.
  • horizontal pattern a flap on the long side of the envelope
  • vertical pattern a flap on the short side of the envelope
  • Available in differrent sizes holding documents up to A4, A5,A3,B4 and F4
  • These smart and stylish poly envelopes are ideal for school, work, office ,travel, personal or even at home with portable sizes easily to carry,
  • keep your belongings in order, organize the sundries keeping loose documents on the move, organizing work documents, personal files, memos, receipts , drawings, presentations, photos, letters etc.
  • and protecting documents from dirt, grease and moisture.
  •  

    Expandable Plastic Envelopes
    Model Product Size 
    : WidthxHeightxBottom Width    		 Document Size : WidthxHeight Flap Envelope
    Horizontal A4
    401Q     		 32.7x25x3 cm. A4 : 21x29.7 cm. a flap on the long side with 1 snap button closure
    Horizontal F4 400F  38x26.5x3 cm. F4 : 21x33 cm. a flap on the long side with 2 snap button closure
    Horizontal A5 405A  22.5x18.2x3 cm. A5 : 14.8x21 cm. a flap on the long side with  1 snap button closure
    Vertical A5 415A 15.7x22x3 cm. a flap on the short side with  1 snap button closure
    Horizontal A3 403A  42.5x32.5x3 cm. A3 : 29.7x42 cm. a flap on the long side with 2 snap buttons closure
    Horizontal B4 404B  41x28x3 cm. B4 : 25.7x36.4 cm.
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ซองพลาสติก ซองใส่เอกสาร ซองกระดุม Plastic Envelopes แฟ้มกระดุม ซองติดกระดุม แฟ้มขนาดใหญ่ ซองพลาสติกขยายข้าง

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Customers can transfer payment for products to the company's bank account as follows

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ธนาคารไทยพาณิชย์ จำกัด (มหาชน) Bank branch/locationบางโคล่ Current
บมจ. ธนาคารกสิกรไทย Bank branch/locationยานนาวา Current

Exchange or return policy

OST Overseas Company would like to express our sincere gratitude to all customers who have continuously supported us. We are committed to providing the utmost satisfaction to our customers.
For products purchased from our website https://www.ost.co.th, we are happy to accept returns or exchanges within 5 days from the date the customer receives the goods. (We will use the delivery receipt issued by Thailand Post or the shipping company as the main reference.)
We will accept returns and exchanges in the following cases:
1. Incorrect products:  The product does not match the customer's order (type, color, size).
2. Manufacturing Defects: Defects caused by the manufacturing process.
3. Incomplete Components: If any components of the product are missing or not complete as stated on the website.
4. Transportation Damage: The product is damaged during shipping and cannot be used. Evidence must be provided through a continuous video recording from the moment of unboxing until the damage is discovered.This is necessary to facilitate a claim with the carrier. (Compared to the video that the company took while packing the product into the box.)
5. Products to be returned for exchange must be in a good condition and undamaged packaging, and the quantity of products and parts must be complete.
* Regarding product exchanges,the company reserves the right to exchange for the same product ordered.
** We kindly request customers to record a video from unboxing the package provided by the delivery service and keep it for all orders as evidence in case of a return. This will benefit customers in terms of convenience in clarification process.
Return Procedure
If the product that the customer wishes to return or exchange comply to above terms and conditions, the customer can proceed with the return and exchange process as follows:
1. Notify us of your intention to return or exchange the product via: 

      1.1.  E-mail: crm@ost.co.th 

      1.2.  Line: @ostcom 
Please provide the following information:
  • Full name of the customer
  • Contact number or the most convenient way to contact the customer
  • Photo of the receipt or order issued by the company's system
  • Reason for return or exchange
  • Clear video and images for the customer's convenience.
2. We will contact the customer within 1 business day (excluding Sundays and public holidays).
3. After we have notified the customer of the result of the return or exchange request, please repack the documents and all received products back into the box along with standard packaging guidelines.and send them back to the company at the following address: 
OST Overseas Co., Ltd. 
(Return and Exchange Department) 
450 Rama III Rd., Bang Kho Laem Subdistrict, 
Bang Kho Laem District, 
Bangkok 10120
(Please kindly send the shipping evidence from the post office or shipping company to the company as well.) 
Please complete this process within 5 business days from the date you receive the company's email confirming the product exchange.
4. In the case of a return,  the company will ship the replacement product back to the customer within 5 business days from the date the company receives the returned product.
5. In the case of a refund, the company will refund the customer within 3 business days from the date the company receives the returned product. The refund will be transferred to the account that was used for the original purchase or to an account in the customer's name only.
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ร้านOST Overseas
OST Overseas
OST Overseas Co., Ltd. established in 1981, has rapidly grown over the past 40 years to become one of the leading manufacturers and distributors of stationery and office supplies in Thailand. We also provide made-to-order items under Customer’s Brand or Private Label (OEM). With our own design and development team, We are market leaders in “in-style stationery” cover all kinds of PP (Polypropylene), PP Foam Files & Folders such as Clear Holder, Display Book File, Expanding File, Ring Binder, Card Holder, Bookmark, Educational Posters, games etc.
Mobile number : 085-395-9642
E-mail : ostmyshop@gmail.com
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Open sinceMar 17, 2021
Last updatedSep 6, 2025
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