["3-in-1 Multifunction Use：The panniers bike bags with adjustable bracket clip is suitable for most bicycles. Fits 11-18mm(0.43-0.71) rack tube on the market (The internal spacer can be removed).The bag is equipped with a hidden shoulder strap at the back which can be used as a backpack or messenger bag. Whether you are traveling or commuting it can help you solve storage problems" "Waterproof Materials: Panniers bike bags is made of high-quality PVC material and 100% seamless waterproof zipper design which is waterproof tear resistant wear-resistant and heat resistant. Whether it's raining snowing or riding on muddy roads this bike panniers can walk with you and protect your valuables. If there are water drops or dirt on the surface of the bag just wipe it gently with a paper towel or wet cloth" Multiple Storage Space: There is a pocket of panniers bike bag on the front can hold mobile phones or other items. Small D button on the top can be hung with keys or trinkets. Two nylon mesh bags on the side can be used to place water bottles umbrellas etc. There is a computer compartment inside which can store up to 15.6 inch computers. There is also a zipper pocket and two open pockets inside which can store personal small items of bike rack bag Easy To Install Open the rectangular zipper on the back of bike rack bag and according to the diameter of the bicycle rack tube whether it is necessary to take out the gasket. You can adjust the bike panniers width to the left or right according to your needs. Bind the fixed frame strap to the frame. Installation is complete ( If you need to store more things you can buy one more and hang it left and right ) "Perfect Gift For Life; The 20L-29L large capacity package of bike panniers is ideal for long outdoor trips daily trips or grocery stores. Its the best choice for you to give you.