Throwing this bottle on the ground gives the nearest creature 100 Experience points. The cost of said bottle is around 10 gp, but the Dm can decide to adjust the price. Bottles can be created by instead of receiving exp, transferring it to a jar or vial. You can only transfer it in 100 points per jar/vial, however having an enchanted or expertly crafted bottle could in theory store larger amounts.

(Selling higher tier bottles with more Exp is fine to.)