There are Five sizes of backpacks , you can choose according to your needs.Note :As shown in the detailed picture, these backpack size is measured after being filled with items, not the size of these empty backpack!!The measurement method is pure manual measurement, there may be an error of 1-3cm, please understand !thanks ! 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 Backpack detail :Description:This Tactical Backpack has a rugged construction and modular application is the foundation of our design to help you conquer routine, the unexpected, and everything in between. Combining the most rigorous military features with mountaineering ergonomics, this tactical backpack can be used as a 3 day assault pack, bug out bag backpack, combat backpack, range bag, hunting backpack, survival backpack, outdoor hiking, adventures, rucksack military army backpack or trekking backpack, or for your everyday use. Versatile Anchor points on the exterior and interior of the pack enables you to continually adapt and evolve the pack configuration to your changing needs. A lightweight attachment system along the handle provides an easy way to attach bulky items such as a rope or jacket to the top of your pack for easy access. Comfortable Aerated closed cell foam padding aids in superior shock protection and comfort. Built in mesh straps and back panel designed to provide proper ventilation while resting against you. Wider straps were designed to spread the load on your shoulders evenly distributing the weight of the load. Engineered to handle heavier loads more comfortably. It is an ergonomically designed backpack built to be your trusted companion for adventures both close to home or missions far away. Modular Laced with Pouch Attachment webbing and is compatible with Modular Lightweight Load-Carrying Equipment (MOLLE) pouches so that you can customize the layout of your gear to suit your needs. Features:1.Comfortable design with ventilated mesh padding on back and shoulder straps designed to keep you cool. Padded shoulder straps, mesh padded back, adjustable chest straps, and top handle are provided to help comfortably carry extra heavy loads2.Carrier backpack is of high intensity and durable. Sized to fit a wide range of torso lengths. it will suit different bodies. 3.Double Stitched Modular MOLLE System Throughout The Bag and Shoulder Strap To Add On Additional Pouches & Other Tactical Gear 4. The assault pack backpack can be used as 3 day assault pack, bug out bag backpack, combat backpack, range bag, hunting backpack, survival backpack, rucksack military army backpack or trekking backpack. \ 80L 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 70L Expand to 100 L Large capacity outdoor 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 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 Bag 35L Backpack ： Description: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 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: 30LPaypent:we only accept paypal currently.Shipping:Fast Shipping from US1. Item will be shipped within 1 business days after received a verified payment and showed "Completed" status. ( excluding weekends and national holidays) .2. We ship to Ebay's address ONLY. Please make sure your address in ebay is matched with your shipping address.Return Policy:1. One month money back guaranteed and no questions asked. If you are not happy with your purchase, simply send it back for a refund or replacement within one month after you receive your order. you can either open a return request or contact us via ebay message. 2.Returns are processed automatically through our system if you just don't want it without any quality problem. 3. Our products are guaranteed 100% against defects. In case of being defective, merchandise can be returned at our cost with return shipping label provided within one month. 4.Buyers are responsible for return shipping, unless it is defective products or mistakes on seller sideAbout us:1. Our goal is try our best to let our customers enjoy the online life.2. We will make progresses not only in high products but also in high service day by day under your supervision.3. the positive feedback is very important to us, we'd extremely appreciate if you can give us five star positive feedback. please do not give us negative feedback without any communication. Fell free to contact us to solve any problems.Thanks for Looking!