I've been using those Midway pistols cases as well, they are great quality. What I do to keep from lugging one massive range bag to every range trip is offload some of the stuff into the smaller pistol bags:
- Keep a dedicated one of those Midway cases stocked with mags/ammo for each major pistol platform that I shoot frequently: 1911 .45, 1911 9mm, M&P, Sig P365, Ruger MK IV. At range time if taking more than one of the same type of pistol, then my Explorer range bag can hold up to 4 pistols as well, even though it's barely even a 'midsize' bag.
- Keep an Explorer R2 range bag as my general purpose range bag. Here I keep the common stuff that I use nearly every range trip whether rifle or pistol. This bag is great, it can also hold 2 pistols in dedicated side pockets with pull-out pistol cases + 7 mag slots per side, and can hold additional pistols in the end compartments, or in the divided center compartments. It's a nice mid-size bag and of the range bags I've tried, it's not the most heavy duty I've ever used in terms of stitching, zipper, etc, but it's the most well thought-out in terms of practical organization. And the durability still seems good, I've not had any issues with the zippers failing or stitching coming out yet, but only used for about 4 months.