S=9.5x14.5,M=10.5x16.Our bubble envelopes feature a generous lining of air bubbles, effectively shielding your valuable items from damage caused by external impacts. These envelopes utilize an all-season adhesive that maintains its strong bonding power year-round, regardless of whether the weather is extremely hot or cold. This high-strength adhesive design helps prevent your items from being tampered with or secretly swapped during transit. The adhesive strip is protected by a peel-off liner, allowing for quick and effortless sealing. The thickened shipping bag features a durable polyethylene outer layer that resists punctures and damage. Furthermore, thanks to reinforced edge-sealing technology, this shipping bag offers exceptional water resistance and tear resistance. Weight: 1.47 lbs.