O2totes Portable Oxygen Concentrator Backpack for Inogen one 。OxyGo Backpack w/ Pockets - Floral (O2Totes). This backpack is specifically made to carry the Inogen one and oxygo oxygen tanks, batteries and all supplies. It is made of polyester so it wipes clean. This bag also has 6 pockets, 4 separate compartments and has padded straps for comfort. Measuring 8.5 x 10 x 8.5” is a good size not to be bulky but still hold everything needed. I actually used this bag for general use because I thought it was cute. Definitely doesn’t have to be used for just oxygen tanks! I see no callouts whatsoever. Please view all photos carefully as they are part of the description as well. Please message us if you have any questions or would like more pictures. We GUARANTEE AUTHENTICITY on all of our items and they will come with a generic dust bag. All of our items come from a clean, smoke-free and dog friendly home. Thank you for shopping our small business. 48 Please note: We package all items safely and securely in a box. We do not use poly mailers, except for some clothing.