Unique Design Backpack: Hiking backpack in expandable version. Large capacity & lightweight hiking daypack. Before extension:14 x 8 x 21.5 inch (40 L). After extension:14 x 8 x 25.5 inch (50 L) Expandable & Extra Large Capacity: SEMSTY hiking backpack can be expanded by using the zipper at the bottom (from 40L to 50L). Roomy enough for a CARRY ON. The side buckles make your stuffs safe and make the backpack not too bulged even it's fully packed. Multi-compartments can hold everything you need in travels, such as phone, bottles, umbrella or camping supplies etc. You can easily organize all your essential stuffs. An outdoor backpack perfect for hiking, camping and travel Ergonomic and Comfortable Design: Thicker padded back with ergonomic breathable design paired with adjustable, breathable and padded shoulder help to reduce fatigue during a long day of hiking. The hiking daypack comes with outside straps to hang your sleeping or other gears. The adjustable chest buckle works perfectly to distribute the back pack’s weight and keep it steady and centered. It is a perfect travel backpack for outdoor sports High-Quality Material: Our camping backpacks are made of high quality tear polyester fabrics with premium nylon zippers, which is more sturdy and smooth. All the zippers and stitching of our travel backpack for men are reinforced. No worries about zippers stop working after slightly used. Pack and shoulder strap stitching is not easy to tear even if it bears heavy items. All stress points are reinforced with bar tacking to increase its longevity Daypack: Easy to carry:The 40L hiking backpack is lightweight and it’s breathable mesh shoulder straps with plentiful sponge padding help to relieve the stress from your shoulder. The large capacity of 40L provides enough space for outdoor travel,camping,hiking and fishing. It meets size requirements for most airlines. This camping backpack can be used as hiking backpack, travel bags and backpacking backpack,which is suitable for men and women Perfect after sale: If you have any problems, please reach out to us, we will reply within 24hrs. (We provide replacement services for quality problems within 1 year and lifetime customer service) hiking backpack travel backpack travel backpack for women travel backpack for men camping backpack hiking backpack men outdoor backpack 40l travel backpack 50l travel backpack expandable backpack