I love using Avery Elle sheets to organize my small, medium and large stamp sets and stamps to coordinate. I've found that adding a piece of cardboard to the inside of the envelope makes it more durable than just putting clear stamps inside the envelope. I also bought magnetic sheets to put stamps on magnetic sheets and then store them in cases. I would give them 4 out of 5 for strength and durability. I store mine upright and stuff the valve in from the top instead of folding. I found it easier
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