Rubber-stoppered vials may also be used. Larger 2 and 8 oz. These are available from a variety of sources. Larvae in stoppered vial and 2 oz. Exuviae may be stored in a number of ways - inside vials, 3x5 envelopes, or pinned.
Many collections store their exuviae in alcohol, or dry, in vials.
The UMMZ has all three methods in use, depending upon the original condition and storage method of the exuviae. One practice is to place the exuviae into clear 3x5 envelopes with the data on the card. That way, all is visible, and if parts come loose, they stay inside the envelope. However, you have to be careful to avoid crushing the specimen. For this reason, storage in alcohol is a better method, especially if you want to manipulate the exuviae for measuring, etc.