welcome to my store, Hope you have a pleasant shopping trip! Specifications:Size Parameters:S-chest bag size 28cmx18cm/11.0-7.0in, reference bust within 30cm/11.8in, reference back length 25cm-28cm/9.8-11.0in, reference weight within 2.5Kg;M-chest bag size 32cmx20cm/12.5-7.8in, reference bust size within 25-43cm/9.8-16.9in, reference back length 29cm-34cm/11.4-13.3in, reference weight within 2.5-3.5Kg;L-chest bag size 38cmx23cm/14.9-9.0in, reference bust size within 36-50cm/14.1-19.6in, reference back length 31cm-38cm/12.2-14.9in, reference weight within 3.5-6.5Kg;XL-chest bag size 41cmx25cm/16.1-9.8in, reference bust size within 43-65cm/16.9-25.5in, reference back length 39cm-43cm/15.3-16.9in, reference weight within 5.5-9.0Kg;Package List:1 X Cat Backpack CarrierNotes:1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures.2. Please allow 1-2cm slight dimension difference due to different manual measurement.