This 1.5 litre hydration carrier is great, just enough for a whole day skirmishing, or a long hke and camping trip. However the 2.5 litre carrier isnt as good becuase it was shot in an airsoft game through my pack with a sniper and burst spilling all the water in to my backpack, then leaking into my utility pouch destroying all my bb's and my gun gas. But the 1.5 litre is a fine size, even concealed you would need to be a great shot to break it. great product highly advised to be put in a backpack not a special hydration carrier holder, they just break - Submitted by agentX-98