Can u fit folders into this ?

A regular file folder will fit in this. However you will not be able to place too many in it

Will these fit an authorized birth certificate?

Standard letter-sized paper (8½" x 11") fits comfortably in these folders, so it depends on how big the birth certificate is. If it's larger than 8½" x 11", it won't fit unless you're comfortable folding it.

Are the pockets closed at the bottom so small papers like receipts and tickets don’t fall out?

No, the pockets aren't closed on the bottom which allows for their expansion capability. I've never had anything other than standard paper sizes in mine but could see where small receipts and such might work their way out of the pocket depending on how the folder was handled.

ASIN	B0B1Q4VGWL
Best Sellers Rank	#105,533 in Office Products ( See Top 100 in Office Products ) #570 in Expanding Files & Wallets
Brand	Sooez
Brand Name	Sooez
Colour	Black
Customer Reviews	4.7 out of 5 stars 7,384 Reviews
Fastener Capacity	250 sheets
Manufacturer	chinese
Material	Plastic
Material Type	Plastic
Number Of Pockets	5
Paper Size	A4, Letter
Sheet Size	A4, Letter
Style	5 Pocket
Style Name	5 Pocket
Tab Cut	1/5 Cut
Tab Position	Top
Unit Count	1.0 Count
Warranty Description	no warranty available

Sooez Cute Folders, 5 Pocket Folder with Labels, Letter Size Expanding File Folder Organizer, Portable Accordion File Folder for Documents, Aesthetic Paper Organizer Folder for School Office

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