Mine are broken into segments...
General Handgun bag.... Electronic Ear muffs, knee pads , elbow pads, spare earplugs, safety glasses, smaller targets, mag loaders, empty ziploc bags for fired brass...etc
Each handgun has its own bag...with SD ammo in some mags, and spare empty mags for range time... also have loader in each ( I shoot a lot ) they are marked as to what handgun.
https://www.midwayusa.com/product/939160870/midwayusa-tactical-pistol-case
When I handgun shoot... the General bag goes with the other handgun bag (s) .
Ammo is all stored in Ammo cans, marked as to the contents. Rifle ones get a 10rd mag and loaders as well.
Testing ammo... is All in their own surplus'd Pelican type cases.. with spare mag and loader.
Rifle wise, each rifle has its own bag, also marked as to specific caliber... the rifle bag has pockets for mags and a longer pocket for misc. ..loaders, tools, sling spare batteries, etc
http://shootingsystems.com/rifle_cases/assault_systems_assault_rifle_cases_by_elite/
I take a general purpose tool box ( surplus'd, with handles all over it ) with Bino's, tools, spare 20/10 rd mags , small targets, staple gun, PPE, Torque Tool, bits, marking pens, paper pad...
First Aid ( Ya never know... )... all is in a clearly marked Cabelas Clear Plastic Dry Storage box...
https://www.cabelas.com/product/Cabelas-Clear-Dry-Storage-Ammunition-Box/740706.uts?slotId=2
The range shooting bags ( squeeze, front, rear... all fit into a Cabelas GP bag, with a 1/4 plywood piece cut to fit and bedurred ( so it is rigid ) on the bottom... all the shooting bags go in there, bulky, but they are all right there with me... ( I end up lending some out to the other folks that don't have any at the bench ... Lol while they try to shoot for accuracy / sight in a rifle ) and knee pads, elbow pads...
https://www.cabelas.com/product/Cabela-s-Ripcord-Duffel/1951592.uts?productVariantId=4049747&WT.tsrc=PPC&WT.mc_id=GoogleProductAds&WT.z_mc_id1=04060953&rid=20&ds_rl=1252079&gclid=EAIaIQobChMI8oOY46Ow3AIVgchkCh3-ywe6EAQYBCABEgI7ZPD_BwE&gclsrc=aw.ds
Chrono has its own bag... spare batteries, tripod, etc included.
Spotting Scope...came in its own bag, lens cleaning stuff, tripod.. etc
Targets.... arrgh... I have bought a few different sized Rigid Art bags.. like these ..( an on going battle, since quite a few have been converted into storage of all those " Hey that's a good deal on Targets )
https://www.draftingsteals.com/21988.html?cmp=googleproducts&kw=21988&gclid=EAIaIQobChMI8eCprKaw3AIVQWx-Ch3VeA13EAkYAiABEgIATPD_BwE
I have it all segmented like this to help me not forget something.... and I still am working on it ! So it can be a long on going project, especially when I add a new caliber !
Hopefully that long winded post helps someone at least get some ideas for shootin' stuff storage... Lol