Large backpack with big sidepockets?

Hi everyone - my second only post here on bushwalk.com! 
I'm about to introduce my kids (x2) to some multiday hikes/Xcountry skitrips which means I will be the packhorse and therefore will need to upgrade to a much larger backpack to lug the tent (NF VE25), stove/cookset, FA kit, extra water, occaisional climbing gear/rope etc. I currently have an ~80 litre pack but find it's just too small for the above task.
I'm a bit old school and want several external pockets, 'real' pockets that I can actually fit things in (ie. My whole cookset in 1 pocket) I'm thinking ~100litres would do the job (yes I know that's BIG!) I looked at Bergans from Norway that had the perfect pack that fitted my requirements (large, external pockets etc.) - perfect until I saw the price! I also found after some Googling a US branded pack called a Kelty 'Red Cloud' - never heard of them...
Alternatively does anyone make/sell external zip pockets that can strapped to the sides of my existing backpacks side compression straps?
Does anyone here have any recommendations?
Thanks in advance

I'm about to introduce my kids (x2) to some multiday hikes/Xcountry skitrips which means I will be the packhorse and therefore will need to upgrade to a much larger backpack to lug the tent (NF VE25), stove/cookset, FA kit, extra water, occaisional climbing gear/rope etc. I currently have an ~80 litre pack but find it's just too small for the above task.
I'm a bit old school and want several external pockets, 'real' pockets that I can actually fit things in (ie. My whole cookset in 1 pocket) I'm thinking ~100litres would do the job (yes I know that's BIG!) I looked at Bergans from Norway that had the perfect pack that fitted my requirements (large, external pockets etc.) - perfect until I saw the price! I also found after some Googling a US branded pack called a Kelty 'Red Cloud' - never heard of them...
Alternatively does anyone make/sell external zip pockets that can strapped to the sides of my existing backpacks side compression straps?
Does anyone here have any recommendations?
Thanks in advance