JIAANOutdoor Backpack 120L, Great For Hiking, Trekking, Camping, Travel, Mountain Climbing. Waterproof, Black, 75*40*40cm

--- Really big ---It is all floppy material so all compartments can be pushed & pulled around to allow for boxes with awkward shapes as you will see from my examplesI've done my best to provide accurate internal measurements and have checked each one before posting this reviewI estimate that the useable volume is at least 117 litres1 Main compartmentMy 49x45x22cm toolbox fits in with no problems and with plenty of room left on top for the rest of my gear. I've spent 10 years looking for a rucksack that my toolbox will fit in so I don't have to keep unpacking it for travelling.It has a nice wide 44x32cm opening at the top so it is easy to pack & unpackIt closes with a double-headed zip so it can be done up into the middle underneath the backflap - it's a zip not a drawstring so perhaps that is a translation error on the product page44 cm across32 thick at the top, 38 thick at the bottom75 tall{which makes up at least 105 litres, probably a bit over 110 litres}It is floppy so it can accept odd shapes. I've just tried a 55x53x16 cm box and it went in without a struggle2 Upper backflap pocketYou can see this clearly in the product photos at the top of the product pageIt is held down by, and its zip is covered by, the two upper strapsAs also shown in the photos, when done up, about half of it hangs vertically on the back & about half lies horizontally on the topIt covers half of the top so it gives an extra bit of water protection to the main compartment.It is 38cm across x 39cm down and has no thicknessBeing floppy, solid things can be put inside - for example, I've just put in 3 boxes of 20x10x10cm{so I've had 6 litres volume in there}3 Lower backflap pocketYou can see this clearly in the product photos at the top of the product pageIt is held down by another pair of strapsIt is 30cm across x 27cm down and has no thicknessBeing floppy, solid things can be put inside - for example, I've just put in a 21x25x4cm box{so I've had 2 litres volume in there}4 Lower inner pocketYou can just about make this one out in some of the product photos at the top of the product pageI think this must be what the product page refers to as the 'Interior pouch' for a 'water bladder'It is covered by & hidden by the lower backflap pocketIt is 30cm across x 28cm down x 4cm thick{which makes up 4 litres}Being floppy, odd-shaped things can be put inside - for example, I've just put in a 21x20x10cm box5 Side [boot] pocketsYou can see these clearly in the product photos at the top of the pageI've had a workboot in each one and the straps do up so they are secured in placeI've had a 2 litre bottle of cider in each one and the straps still do up--- Durable ---Strong materialWell-linedWell-sewn together - I only found four bits of thread sticking out and none of them lead to any unravelling when I tugged on themRobust zips - they are, I believe, No. 10 size [like those I have on a rucksack that has lasted 20 years]--- Well-designed ---Decently water-resistant - I made a cup shape of the backflap, poured water into it then let it sit as a puddle for a minute and there was no absorption that I could see [when I poured the water off, there was a slightly damp feeling left behind on the outside but none at all on the inside]Between them the upper & lower backflap pockets cover almost the whole of the top & back so the main compartment has an extra few layers of water resistance - I think this must be what the product page refers to as the 'included extra rain cover pouch'It does not press against the back of my neck when fullThe back is padded and feels okay against my own backThere is a lifting strap at the top of the back so it can be hauled around without putting it onIt does not hang down over my rear end so sitting down is easy [I'm 6ft tall]The shoulder straps are firmer than I've ever found on other rucksacks so the weight is spread across my shoulders much betterThe webbing straps on the shoulder straps are sewn in place intermittently so there is space to put big hooks through for carrying extra bags in front [they each also have a nylon hanging buckle but I've threaded a pair of big metal split rings through the straps instead because I trust them more than I trust nylon]There is a chest strap to brace the shoulder straps horizontally against each other so they don't slip across my shouldersThere is a waist strap to stop it swinging around as I walkIt has some usefully-placed 4cm webbing straps across its back & sides into which I've threaded some split rings so I can hang things on it [such as bags for bread & eggs that I'd be worried about crushing inside]

I brought this pack well it has plenty of space and spare pockets to put things in the biggest part of the design is fantastic it's down or flaws are it's not waterproof and the strapping could of been made stronger with a stronger webbing material like the army use on there back packs but it' is great how long it lasts is another thing I've had it to put on the back of my scooter and power chair when I go out places or shopping I'm pleased with it but I hope they do one that's waterproof and better strapping webbing if kept dry it should last awhile you could put a bin bag inside to keep things waterproof like I did in the army problem solved lol ide recommend it to ppl if it keeps the same price tagg or cheaper

2 weeks worth of kit and the bottom just fell out, less than 60kg inside...