Would this work on any running fanny pack or only the spi belt?

The Race Bib Toggles are compatible with most running belts.

Will this work on a belt that is 2" wide?

Yes, it will work on a belt 2" wide. The smaller the belt the easier they are to use, but they work well on belts 4" or less. After that, it gets a little trickier to use and the belt still be functional during a race.

ASIN	B003X3VGN6
Best Sellers Rank	#230,575 in Sports, Fitness & Outdoors ( See Top 100 in Sports, Fitness & Outdoors ) #7,551 in Cycling Accessories #113,404 in Running
Country of Origin	USA
Department	unisex-adult
Item Weight	18 g
Item part number	unknown
Manufacturer	SPIbelt
Net Quantity	4 Count
Package Dimensions	12.7 x 7.7 x 1.9 cm; 18 g

SPIbelt Race Bib Toggles, Attach to Race Bib for Marathons, 5k and 10k, Black (2 Pairs)

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