7) Top: heat seal / sewing thread / open mouth / valve / flat
8) Bottom: heat seal / sewing thread / block bottom / valve
9) Surface: anti-slip / plain / UV treated
10) Service: OEM or ODM
11) Sample: 1 pc can be sent for testing before bulk production
12) Usage: cement, powder, fertilizer, putty, gypsum, animal feed, rice, flour, chemical products, construction material