If you use ziplock baggies, I would recommend buying the freezer baggies. They're more expensive, but they're thicker, tougher, and less prone to tearing. And baggies take up virtually no extra space in ammo cans.
I agree, the name brand freezer bags are more durable than the other bags.
But, I have found with pint or quart size, the cheap bags will last one or two cycles. Good and economical if you think you will dispose of the bag in short order. I have pretty much stopped using gallon sized bags, I like the pint size best although sometimes they are too small.
I have freezer bags that I have cycled through many cycles. They hold new ammunition, the empties coming home from the range and the clean prepped cases waiting for reloading. When they get too grungy, then I use them for the fired cases only.
Like others, I put a paper label in the bag describing the load and lot in the bag. I package my bags with 50 rounds so that I know how many cartridges that I have grabbed.
Yes, 50 cal ammunition cans can get heavy when filled with pistol ammunition. But mine generally remain at home, I draw out what I think I may shoot at that session. Somewhat self limiting and I do not over shoot even with my range just 100 yards or so from the ammunition magazine.
As my inventories of ammunition have increased, I have trended to 50 cal cans over 30 cal cans..