will the bag fit a hand knitted baby blanket?

Of course it depends on how big th blanket is. The bag quite easily fits a large jumper so I'm guessing you would be okay but I wouldn't say with certainty without knowing the exact size and thickness of the blanket.

Will it fit a lever arch?

PS I'm assuming the lever arch has a spine width of around 2.5".

Will it fit a suit jacket?

They are only 12" wide and 16" long so I don't think you would get a suit jacket in.

Can they fit average game cases? Ps4 Xbox ect

I would agree with Bosh's answer on this. Absolutely Yes. They are strong bags too.

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25 Mailing postal bags STRONG, Self-Seal 12 x 16 (305x405) plastic

Product ID: 51730359

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📏12 x 16 inches

📦25 bags per pack

🔒Self-seal closure

Description

📬 Pack it, seal it, send it—effortlessly!

BULK SAVINGS - 25 bags in one pack means more value for your money!
PERFECTLY SIZED - Generous dimensions of 12 x 16 inches accommodate various items.
EFFORTLESS SEALING - Self-seal design ensures quick and secure packing.
ECO FRIENDLY CHOICE - Made from recyclable materials, supporting a sustainable future.
UNMATCHED DURABILITY - Crafted from high-quality plastic for ultimate protection.

These 25 self-seal mailing bags, measuring 12 x 16 inches, are designed for durability and convenience. Made from high-quality plastic, they provide reliable protection for your items while ensuring quick packing with their self-seal closure. Perfect for e-commerce businesses and personal use alike, these bags are a smart choice for anyone looking to streamline their shipping process.

Specifications

Manufacturer	Grey Mailing Bags 12" x 16"
Brand	Grey Mailing Bags 12" x 16"
Product Dimensions	40.64 x 30.48 x 0.1 cm; 240 g
Colour	Grey
Closure	Self-Seal
Shape	Rectangular
Material Type	Plastic
Number of Items	25
Size	305 x 405mm
Item Weight	240 g

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