On your wiki you have a page for why your backpacks are the "Best Backpacks". So I figure if I use any other backpack while having you mod installed you would want to know why. Hence I'm doing this report in spite of knowing it wont be added to the MC version I play (1.7.10).

I use the forestry backpacks. I like that they help keep my inventory clear of items that are at that time junk (they will be need later, but not now). At the start of the game I wouldn't have the materials to make one big bag, so I would be making more than one anyway (6 forestry backpacks is normal for me without this mod). Its a bonus that I can have them pick up different things. So when I want to get something out of them I have some idea what bag it would be in. I can then set up chests at my base based off of these bags and have my base storage somewhat sorted too. If I only click it with the Hunters bag then no cobble should go into that chest, but there will be cobble in another chest that I click with the diggers bag... Etcetera.

You have the Mining upgrade and that is good. But I want a bag for tree stuff; Logs, saplings and seeds... Do you know how many seeds "Pams HarvestCraft" adds? Setting up the Advanced filter is not going to be fun, can you even have multiple Advanced filters? Sure you can get around pams by using the mod filter but that’s not always the case. Some packs I've played have a dozen mods adding monsters so you cant use a single Advance filter for them; but a mod filter wont work because the monsters are not the only thing the mods add... I may want the Zombie brains Thaumcraft adds in my monster drop bag, But the shards belong in the mining bag. I want the ammo and guns from techguns (about 20 guns, 10 clips and 8 types of ammo off the top of my head) in one bag but I don't want the armour, ore, decorative blocks in there. As I maybe looking during combat I need to find the right ammo or replacement gun fast.

What I suggest:
Make it so we can make our own filter configs. Have a folder in the config folder. For each file in this folder create a filter with the same name as the file, all custom filters would have the same icon in game. The file contains the recipe to make the filter, related settings (upgrade point cost, displayed name for different languages) and a list of items to be picked up

Add Customizable Filter Upgrades via Config

I'll suggest an improvement: Add a single "Custom Item Filter" which can select filter files from a config directory (/config/ironbackpacks/filters/name.cfg). Selected like the ExtraUtilities1 Advanced Filter.

Perhaps have some built-in example files that mimic the effects of the Forestry backpacks (miner, digger, forester, hunter, etc.)

I can look at implementing some form of this in the 1.11 rewrite.

Thanks for the detailed writeup @DragGon7601; I agree with TehNut in that we will try and improve this for 1.11+