I push the straw in pretty tightly but it often pops out across the room while I'm using it which is the only downside. I will come back for more when needed.
I used the NXT Technologies™ Air Duster to clean out the tower fan sitting on my nightstand. It was so dirty that it was blowing dust bunnies everywhere. Took the fan and can outside and blasted all that dust build up away - no power outlet required. I'll definitely do this more often especially since I have another can from the 2/pack.