1) GO TO THE WEBSITE OF THE COMPANY THAT MAKES YOUR BAG.

2) FIND YOUR BAG AND MAKE A NOTE OF THE EXACT MEASUREMENTS.

3) COMPARE THE MEASUREMENTS OF YOUR BAG WITH THE MEASUREMENTS OF SIR NATHAN’S INSERT DIMENSIONS BELOW.

4) CHOSE AN INSERT THAT IS 1-3 INCHES SMALLER THAN THE MEASUREMENT OF YOUR BAG (DEPENDING ON HOW SNUG YOU WOULD LIKE IT TO FIT).

FOR EXAMPLE:

SIR NATHAN’S X-LARGE INSERT THAT MEASURES: L 13.4″ x W 6.7″ x H 7.1″

FITS PERFECTLY INTO A VICTORIA’S SECRET EVERYTHING TOTE THAT MEASURES: L 16.5″ x W 8.5″ x H 13″