I've stuck with British Army Bergens, my old 100litre DPM Bergen lasted years, probably around 15 I guess, the only reasons I replaced it is that the top skirt had a rip in it and it was delaminating. As a rucksack it still works!
I replaced it a couple of years ago with an Airborne Bergen https://www.militarykit.com/products/kombat-airborne-bergen-100-litre
Front pockets take Delkim receiver, stove and Spods and Spombs.
Top outer pocket takes cup, top inner pocket takes scales and weigh bar. The main rucksack is loaded as such:
Frying pan, spatula and plate against the back of the rucksack.
Waterproof jacket and trousers right at the bottom. On top of them go spare socks, trousers and t-shirt and a long sleeve top dependant on time of year. Then the saucepan, 2 gas canisters, Bialetti coffee maker, a rig bin with bottom bait rigs and a rig wallet with pop-up rigs. On top of that is my fleece and my coffee and sugar containers, usually packed in last.
As much as @elmoputney hates it, my tackle box contains all the bits, leads, baiting needles, rig rings, quick links, hooklink materials etc.
My food bag is the Korum ruckbag which also has a couple of powerpacks in the side pocket.