I should but I never have them with me.

Wondering if I should invest in some more bags since I don't have that many.

Like these:
http://www.amazon.com/Oversized-Grocery-Multipurpose-Shoulder-Webbing/dp/B0012829XK/ref=pd_bxgy_misc_img_b

http://www.amazon.com/Reusable-Grocery-Tote-Super-Saver/dp/B0013N15UC/ref=pd_sim_misc_12