When comparing Tortuga Packable Daypack (20L) vs Sea to Summit Ultra-Sil Day Pack (20-Liter), the Slant community recommends Sea to Summit Ultra-Sil Day Pack (20-Liter) for most people. In the question“What are the best packable backpacks around 15-20L?” Sea to Summit Ultra-Sil Day Pack (20-Liter) is ranked 1st while Tortuga Packable Daypack (20L) is ranked 3rd. The most important reason people chose Sea to Summit Ultra-Sil Day Pack (20-Liter) is:
Packs down small enough that it can easily fit in your pockets.
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Pros
Pro Laptop sleeve
There is a dedicated laptop sleeve (not padded) inside that fits up to a 15" laptop.
Tortuga recommends that it's used for short distances only.
Pro Lightweight considering the features
It's one of the few packable backpacks that offers a padded backpanel and shoulder straps, but still keeps the weight reasonable at .7 of a pound.
Pro Packs very small
Packs down small enough that it can easily fit in your pockets.
Pro Extremely lightweight
At only 2.4oz, it's one of the lightest packable backpacks around.
Cons
Con Packs down to around the size of folded shorts
A sacrifice you're making for the added features (like the back and shoulder padding) is that it doesn't save space as much as other options. It folds down to 9 x 8.5 x 2" (23 x 22 x 5 cm), about the size of a folded pair of shorts.
Con Shoulder straps are uncomfortable
The shoulder straps have absolutely no padding, so it doesn't take much weight in the pack for them to start digging into your shoulders.
Con Only one compartment
In order to keep the pack so light weight, there is only one compartment.