The Convertible Carry-On Backpack - Travel Backpack – Rick 。?Product size: Normal Size 45L(No Expandable) :33X24X57CM / 12.9X9.4X22.4 IN(L x W x H ). weight:1.8kg(3.9Lb). Large 60L(Expandable ):33X(24+7)X57CM / 12.9X(9.4+2.8)X22.4 IN(L x W x H ). weight:1.8kg(4Lb). Extra Large 65L(No Expandable): 37X26X66CM / 10.5X14.5X26 IN(L x W x H ) . weight:1.7kg(3.7Lb). ?2. Large capacity design: Clothes, mobile phones, wallets, shoes, umbrellas, laptop, water cups, and other personal items can be put in. Separate laptop compartment. Large 60L and Normal size 45L fits in Hiking daily use Travel Airplane Carryon Camping has separate shoes bag. Extra Large（65L) size has more storage space than Large size and can be used for Hiking Camping long-distance Travel or Winter Sports Snowboarding (larger shoes bag can fit in snowboarding shoes/helmet...) ?3. Strong and durable: Made of high-quality polyester fabric, lightweight waterproof, wear-resistant, and scratch-resistant, Metal pull head, the zipper is very smooth and durable. ?4. Can be used in sports, fitness bags, swimming bags, cycling bags, mountaineering bags, and hiking bags, Suitable for different scenes. ?5. 45L and 60L versions have one sling strap It Can be used as a shoulder bag or backpack. 65L Version Only Can be used as a backpack. These sizes all have 2 or 3 handles that are easy to use.