As we get older, lifting and pouring any liquid from a large container becomes more uncomfortable. For some, it even becomes completely unwieldy. I thought I'd mention that in case anyone here has reached a time in their life that the challenge of lifting and pouring a gallon of anything is more than you want to consider when that liquid is a 50% lye solution.
If any of you order your lye from Essential Depot (a few times a year they have a really good sale and no shipping charges, making it a good deal), the bottles their NaOH comes in are perfect for storing your 50% lye solution. And they are small enough that lifting and pouring is not as much a challenge for arthritic or weaker hands. PLUS, they are already labeled as Lye, so all I have to so is add a note about it being 50% concentration & I put the date I made the solution on the masking tape (my own added label) as well. AND the lids are quite secure with a child-lock type closure, making it even safer if it gets knocked over. Although I have never tested it by knocking it over.
When I make my MB, I usually fill about 2.5 - 3 of those ED bottles, which originally hold 2 pounds of lye crystals. The containers are recycle #2, so perfectly safe for storing lye solution.