Field Supply has the Gunmate 1919687 16"x8"x7" Deluxe Soft Range Bag - Black for $18 w/free shipping when you use the following coupon code:
FSGMBAG18
https://www.fieldsupply.com/gunmate-deluxe-soft-range-bag-black.html
It’s on the small side but I think it would do well for ammo boxes and/or eye/ear pro carrying.
Search for it on Amazon and you can see a customer review video that gives more detail - basically it’s an undivided central compartment with a double zipper flap and 2 thin full-length side pockets.
I just ordered 2:
As usual with Field Supply, watch out for other items - they do have good specials on particular items but they also have a lot of crap marked up so don’t assume everything on the site is a great deal.