
I've used older versions that were thick and used a home vacuum to suck out the air. These were much thinner. I had to sit on the bag to squeeze out as much air as possible before using the hand pump. The hand pump removes very little air so you'll get tennis elbow from repeat pumps if you don't manually squish as much air out as possible.We used these bags to move cross-country and about 1/3 of the bags burst open in transit.

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