As a competitive shooter, I use the Clamtainers (30 cal, 20 count) exclusively for carrying my hand loaded ammunition to the local range and to long distance matches. When traveling, space is always an issue and I can pack more rounds in the same space compared to the other alternatives. I can be confident with the Clamtainers that, even if dropped, my rounds will stay in the order and condition I intended. This is especially important when bullets are long seated or rounds are placed in a specific order for load development work or final match use (e.g., weight sorted). I recommend these to anyone serious about maintaining their ammunition in top condition.Brad E. SauveF-Class Target Rifle3-time US National Individual Long Range Champion11-time US National Team Long Range ChampionUSA Team member since 2007