2 Pack Ultralight TPU Mountain Bike Inner Tubes 29/27.5/26" | Compatible with 29/27.5/26inch x1.9-2.5 Tires | Presta Valve 45mm French | High-Pressure Durable Tubing for MTB Bikes

We are big fans of the new TPU tubes for carrying in case of a flat that can't be fixed with sealant and a plug as they're quite a bit lighter than traditional tubes. Originally we used the Tubolito tubes but found that the off-brands work just as well and are quite a bit less expensive.