The lezyne caddy seat pack features fitted neoprene compartments to organise tire repairs multi tools money and id water resistant zippers and reflective tail light loop and a velcro strap system to secure the bag to the seat post and saddle rails available in different sizes the large holds 2 x mtb inner tubes large size multi tool and mobile phone in a sub pocket the medium holds 1 x mtb or 2 x road inner tubes and a medium sized multi tool