well,I can tell you that you can put some dry paper towels in the bag and immerse the bag in the water to verify its tightness. I can guarantee that when you take the bag out of the water, the paper towel is still dry.

Are these bags made in the USA?

The ones we ordered were not made in the USA.

can this be used for car key fob rfid blocking

it can't! Have a special bag.We are preparing for sale. The anti static bag protects the static-sensitive components from potential electrostatic hazards to the greatest extent. Their unique Faraday cage construction forms a 'induction cover' effect to achieve shielding and anti-static effects on the contents of the bag. The wear-resistant metal coating and the inner layer of vinyl material are completely protected by the complex process, the translucent heat-sealing bag type process can clearly identify the items in the bag. Function: a. Prevent the generation of frictional electricity; b. Protected from electrostatic fields; c. Prevents contact with a charged human body or with a charged object to generate a current, causing a short circuit. d.our electrostatic bags have a moisture resistance of Class II and a high and low temperature performance of ±500c,they can also be used to store items that are easily oxidized. Anti-static bags recommended range of use: for electronic product packaging with anti-static requirements, such as various PC boards, IC integrated circuits, optical drives, hard drives, electronic components, etc.

Item Weight	200 g
Product Dimensions	8 x 8 x 11.99 cm; 200 g
Item model number	ZMDIT-01
Special features	ヘビーデューティープロテクション, 防滑
Form Factor	"。
Color	100個 3.15x4.72インチ/8x12cm。

100個 3.15×4.72インチ/8×12cm 静電気防止バッグ、HDD用再密封可能100枚ラベル付き、ハンドドライブや各種電子機器用の帯電防止バッグ

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