The difference between the Shark ION F80 MultiFlex IF281,IF282 and IONFlex 2X IF285,UF280 DuoClean Ultra Light Cordless Stick models are as follows.

images from manufacturer
Where sold.
The IF281 sold at Target, Macy’s, BestBuy, JCPenney, Amazon, and SharkClean official website.
The IF282 sold at Bed Bath & Beyond, and Kohl’s.
The IF285 sold at Sam’s Club.
The UF280 sold at Costco.
Included.
All of them come with
* 2 ION Power Pack Batteries
* ION Power Pack Charging Cable
* 8″ Crevice Tool
* Upholstery Tool
* ION Power Pack Charging Dock
The IF282 and IF285 also include a Precision Duster, whereas the UF280 include an Anti-Allergen Dust Brush.
Color.
The IF281 and IF282 are in graphite grey with sandstone accents.
The IF285 and UF280 are in charcoal grey with blue stream accents.
How do you replace the belt on Model #if285?
Hi Michael, your best bet is to call Shark customer service. Number is 877-581-7375. Here is the link for learning more detail https://www.sharkclean.com/support/.
Have a good day.
I am looking for the manual for Model IF 285 26
S/N
S04H2626H6R3
Hello Johns, you can try to find it via this page https://www.sharkclean.com/support/product-series/1114/shark-ion-f80-multiflex-cordless-stick-vacuum-if280-series/, if you cannot find it, please contact Shark customer service.
Hi, what is the difference between the Shark ION F80 IF281 and the Shark ION F80 IF282? Thanks
Hi Donny, the difference is where sold and what accessories are included.