Greater Manchester police tweeted images of the gym bag Tuesday morning. It was found inside a white Nissan last Thursday.
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Investigators say bomber Salman Abedi made repeated trips to and from the car between May 18 and May 22, the day of the attack.
Abedi set off a bomb that killed 22 people following an Ariana Grande concert in Manchester.
The 49ers released the following statement on Tuesday: "The 49ers were disgusted to learn that a gym bag bearing the name of the team was found as evidence in association with the horrific act of terror that took place in Manchester, United Kingdom. Our hearts and prayers are with the innocent people who have been affected by this tragedy."
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Click here for full coverage on the deadly Manchester Arena terror attack.
Image update relating to previous post. pic.twitter.com/h5PonFBt3k— G M Police (@gmpolice) June 6, 2017