There are 6 sizes of backpacks ,You can choose according to your needs.All is 600D Oxford Waterproof Fabric. 30L/35L/40L/80L/100L/ All come with US Velcro Flag ，But only 120L backpack without US Velcro Flag Note :As shown in the detailed picture, the backpack size is measured after being filled with items, not the size of the empty backpack!!The measurement method is pure manual measurement, there may be an error of 1-3cm, please understand !thanks !The inner layer of the backpack has waterproof fabric, which can be Life waterproof and suitable for light rain. It is not suitable for being waterproof in heavy rain all the time. It will get wet. 120L backpack detail: Specifications: • Material: Oxford fabric• Adjustable Straps: Yes• Molle: Adjustable with Hook Loop to attach accessories• Damping Straps: Yes• Provides a whopping 120L of space for the traveler, suitable for a multi-day trip• Capacity: 120L• Modular Extension: Yes• Reinforced Handles: Yes• Overall Dimension: 19.7″L x 11.8″W x 31.5″H• Colors Available: Black/Khaki/Woodland Camo/Woodland digital/Desert Camo/City Camo/CP Camo/GreenPackage Listing：1*120L Large Backpack 70 L Expand to 100 L backpack detail:Gently pull, 70L seconds change to 100L, what do you want to install?Main warehouse expansion designBottom expansion design Feature:Item ：70L Expand to 100 L Large capacity outdoor backpackType: Outdoor hiking backpackNet weight: 1.7 kgFabric: 600D nylon (commonly known as: Oxford cloth)Capacity: 70 L Expand to 100 LUsage: camping hiking outdoorSize: 15.7″x 11.8″ x 29.5″—15.7″x 11.8″x 35.4″Structure: external structure (front upper pocket, front pouch, side mesh pocket)Internal structure (main warehouse *1, front warehouse *1, computer compartment *1)Carry: back thick sponge 1.Large space loading:Large capacity main warehouse + 4 large external systemIt can Tied tents, mats;Hanging trekking pole;Tied sleeping mats, picnic mats;Side pocket strap2.Waterproof and breathable fabric600D density oxford fabric waterproof, scratch resistant, military backpack fabric, tear resistantOxford cloth fabric, bid farewell to sultry (to make the back more refreshing)3.Stereoscopic 3D breathable backpack system (two centimeters thick breathable honeycomb cotton) Package include ：1* 70 L Expand to 100 L backpack 80L Upgrade New Backpack Detail: Material：Wear-resistant oxford fabric (thick fabric, tear-resistant, waterproof, scratch-resistant, and suitable for a variety of wild environments)Size:28″x14″x10″Color:Black、Khaki、Woodland Camo、Desert Camo、City Camo、Tri-Color Desert CamoSuited People: Backpacker, traveler, experienced TravelerFeature：Multi-pocket design makes it more easyBottom zip pocketLarge capacity zip pocketSide kettle bagBottom small bag zip pocketCome with American flag velcroPackage Listing：1*80L Large Backpack 80L Large Shoulders Backpack Waterproof Military Tactical Climbing Hiking bag80L Product Detail：Material：Wear-resistant oxford fabric (thick fabric, tear-resistant, waterproof, scratch-resistant, and suitable for a variety of wild environments)Size:28″x13″x7″(72x34x17cm)Color:Black、Khaki、Woodland Camo、Desert Camo、City Camo、Tri-Color Desert CamoSuited People: Backpacker, traveler, experienced TravelerFeature：Multi-pocket design makes it more easyBottom zip pocketLarge capacity zip pocketSide kettle bagBottom small bag zip pocket3D honeycomb breathable styleDecompression breathable pearl cottonSeismic EVA layerbreathable sponge to protect waistWaist buckleWaterproofbuckle opening and closing design (it’s more convenient to open and close the bag)Velcro design (can be labeled with various signshardware slider (good texture, smooth pull and durable)side storage buckle (make the things inside bag fixed and not easy to to fall)nylon lanyard design (can be used to hang some items like trekking poles , practical and convenient)nylon hand-held design ( comfortable and durable)shoulder strap adjustment buckle (free adjustment of shoulder strap length according to demand)Shoulder strap D-type buckle (can be used for hanging items like keys, practical and convenient)waist protector design (effectively reduce the burden and at the same time better secure the backpack)Come with American flag velcroPackage Listing：1*80L Large Backpack New 40L Military Tactical Backpack Rucksack Large Waterproof Outdoor Hiking 40L Features:1.Oxford cloth is wearable and high quality2. Large capacity design is suitable for several days’ walking trip3. High strength shoulder straps are reliable4. All buckles can lock5. It is ideal for wild adventure, tactical use, outdoor sports, etc. Specifications:1. Color: muddy, Army Green, ACU, CP, Desert digital, Jungle digital, Jungle camouflage2. Dimensions: (11 x 10 x 22)” / (28 x 25 x 56) cm (L x W x H)4. Capacity: 40L5. Weight: 32oz / 910g6. Material: Oxford Cloth 7. Flag Magic Stickers: Yes9. Waterproof: Yes10.Suitable : Neutral Package Includes:1 x 40L Military Tactical Backpack Shoulder Bag35L Outdoor Travel Military Tactical Camping Hiking Trekking Backpack Rucksack 35L Product Detail：Colour:Black、Green、Khaki、ACU Camo、CP Camo、Digital Desert Camo、Woodland Camo35L capacitySize:11″x10″x20″(28x25x50cm)Zipper: two-way zipper in the main bag, other one-wayMaterial: waterproof nylonSuitable for: outdoor tourism, mountaineering, cycling, hiking, forest crossing, field battle, etcMain bag buckle switchStorage compartmentHigh quality waterproof materialModule extensionPortable mountReinforced nylon handleMain bag two-way zipperSide module expansionSide fastening buckleShock absorbing strapStrap fastening buckleBack shock absorption areaBelt buckleadjustable in Strap Portable mountAdjustable in Shoulder strap suitable and breathable back cushionHigh quality fabricDelicate buckleHumanized design belt buckleVelcro designOversized storage space in main bagPackage Listing：1*35L Hiking Backpacks 30L Outdoor Military Tactical Assault Backpack Waterproof Hiking Shoulders Pack 30L PRODUCT INFORMATION ：1. 30L ultra large capacity2.Top hualian buckle3.Metal D-type hanging buckle4.Both sides also have to expand functionality5.Tightly woven nylon webbing6.Adjustment buckle7. Spacious main compartment and smaller zip pockets to accommodate all your gears8. Powerful add-on hanging system allows you to attach accessories to the top, side and bottom of the backpack9. Compression straps help stabilize the load and minimize the pack profile10. Breathable, foam padded back and extra thick shoulder straps keep you cool and comfortable during long travel11. Chest and waist straps help to alleviate pressure on the spine12. D-rings on shoulder straps for attachment of water bottles, umbrellas, shoes and more13. Made of tough oxford fabric with water repellent coating for ultra strength and durability14. Perfect for camping, hiking, mountain climbing or other outdoor activitiesSpecifications:1. Color: ACU,Black,Army Green,Camouflage,Mud,Sand Color Camouflage,CP ,Pythons Grain black, Jungle digital, Sansha camouflage2. Weight: 29.98oz / 850g3. Material: Oxford Waterproof Fabric4. Dimensions: (18″*10″*10″)” / (45 x 26x 26)cm (H x L x W )5. Capacity: 30LPackage Includes:1 x 30L BackpackShipping Every item is checked carefully before shippingFast Shipping from United States 1. Item will be shipped within 1 business day after received a verified payment and showed “Completed”status. This delivery arrangement is excluding our Public Holiday. 3. We ship to Ebay’s address ONLY. Please make sure your address in ebay is matched with your shipping address.Return Policy:1.We accept returns within 30 days from receipt of item.2.Shipping and handling fees are not refundable. Buyer is responsible for shipping costs incurred shipping products back.3.If any questions with the item you received, please contact with us first, we DO NOT ACCEPT any returns without communication advance.Contact us:1.However at any point in time,if you are not satisfied with your purchase,do not hesitate to contact us via my ebay messages.2.We are committed to your 100% customer satisfaction in 24 hours.3.Positive feedbacks are very important to us,please take extra considerations before leaving us neutral or negative feedbacks.4.We can always settle any problem in an amicable manner privately.Thank you!