These bottles performed flawlessly and never leaked a drop especially considering more than 5000 feet of elevation change that makes leaks more likely low air pressure at altitude makes bottles filled at low elevation prone to leak

As a note i always packed the bottles with the solid caps and only switched to dispensing caps when actually dispensing

The bottles are small durable and lightweight and come in sizes that worked perfectly for me for a 6 day trip with 3 people

Some notes only round 4 oz bottles are squeezable dispensing caps only fit on round 4 oz bottles dispensing caps will leak so use the translucent round bottle caps and switch to dispensing caps only when needed red white green and blue lids are interchangeable on 4 oz rectangular 2 oz square and 1 oz roundif you are going to use them for air travel you cant carry on the 4 oz bottles even if filled with only 3 oz of stuff ive had other nalgene bottles for travel before and they worked well