Thanks Hellen for the heads up on the straw mod....it doubled my vape time per cart fill! Its like night and day. I used a cart that I thought needed to be topped off...I cut that little straw, put in in and I didn't top it off and I vaped off that same cart for another 45mins..amazing! Anyone who is tired of constantly filling or topping off carts should try this one. I use a 901 so my cart capacity is small and that little straw is awesome. I dont know how to post a link to another thread so just search the forum for "straw modification" and it will get you there. Also..the good juice taste seems to last way longer too. : )